The twenty-four characters of Never Disparaging (Skt. Sadaparibhuta, JP. Fukyo)and the five characters of Nichiren are different in wording, but accord with the same principle.
-On the Buddha's Prophecy
The twenty-four characters are: "I deeply respect you. I dare not belittle you. Why is this? Because all of you practice the bodhisattva path, and will become buddhas."
The five characters are: myohorengekyo.
The context of the 24 Character Teaching:
...After the parinirvāṇa of the first Tathāgata Bhīṣmagar jita svararāja, there were excessively proud and overbearing monks in the Age of the Semblance Dharma, after the True Dharma had been extinguished. At that time there was also a monk, a bodhisattva, called Sadāparibhūta (Never Despising).
“O Mahāsthāmaprāpta, why was he called Sadāparibhūta? Because whenever he saw any monk, nun, layman, or laywoman, he would praise and pay homage to them, saying:
I deeply respect you. I dare not belittle you. Why is this? Because all of you practice the bodhisattva path, and will become buddhas.
“Furthermore, this monk did not concentrate himself on reciting the sutras but only paid homage such that, even when he saw the fourfold assembly from afar, he would go up to them, praise, and pay homage to them, saying:
I dare not belittle you, because you will all become buddhas.
“In the fourfold assembly there were some whose minds were impure and who became angry, and reviled and disparaged him, saying:
Where does this ignorant monk come from? He says that he himself does not belittle us and predicts that we shall all become buddhas. We do not need such an idle prediction.
“In this way he wandered about for many years and was always reviled. But he never got angry and always said, ‘You will become a buddha.’
“Whenever he spoke these words, people would assail him with sticks or stones; he fled from them yet still proclaimed loudly at a distance:
I dare not belittle you. You will all become buddhas.
“Since he always spoke these words, the excessively proud monks, nuns, laymen, and laywomen called him Sadāparibhūta. When this monk was about to die, he heard in the air twenty thousands of myriads of koṭis of verses of the Lotus Sutra expounded previously by the Buddha Bhīṣmagarjitasvararāja and, completely preserving them, he attained the purity of the eye, and the purity of the ear, nose, tongue, body, and mind that were described before. After having attained these pure faculties, his lifespan increased two hundreds of myriads of koṭis of nayutas of years and he taught this Lotus Sutra to the people far and wide.
“Then those excessively proud monks, nuns, laymen, and laywomen in the fourfold assembly who had despised him and called him Sadāparibhūta saw that he had attained great transcendent powers, the power of joy in eloquence, and the power of great virtuous meditation. Hearing his teaching, all of them believed and followed him.
“Furthermore, this bodhisattva inspired a thousand myriads of koṭis of sentient beings and caused them to abide in highest, complete enlightenment. After his death, he met two thousand koṭis of buddhas, all of whom were called Candrasūryapradīpa. In accordance with his teaching he expounded this Lotus Sutra, and for this reason met another two thousand koṭis of buddhas, all of whom were called Meghasvararāja. He preserved and recited this sutra in accordance with the teaching of these buddhas and expounded it for the sake of the fourfold assembly. Thus he attained purity of the natural eye and purity of the ear, nose, tongue, body, and mind, and taught the Dharma to the fourfold assembly without fear.
“O Mahāsthāmaprāpta, this Bodhisattva Mahāsattva Sadāparibhūta respected, honored, praised, and paid homage to all these buddhas. Having planted roots of good merit, he again met thousands of myriads of koṭis of buddhas; and he expounded this sutra over again in accordance with the teaching of those buddhas. Having perfected his merits he attained buddhahood.
“O Mahāsthāmaprāpta, what do you think about this? Was Bodhisattva Sadāparibhūta of that time someone unknown to you? He was none other than I myself. If I had not preserved and recited this sutra and taught it to others in my previous lives, I would not have swiftly attained highest, complete enlightenment. Because I preserved and recited this sutra and taught it to others in the presence of previous buddhas, I swiftly attained highest, complete enlightenment.
There is the path laid out in the Lotus Sutra that Nichiren taught: Honoring all beings as Buddhas.
I am going to challenge you - if you think that the Buddhist path is anything but the gist of the 24 or 5 characters, then you're not practicing the Ekayana and instead you're just polishing turds. All the practices are derivative of this teaching.
All Buddhist practice is, to put it conventionally, to see the Buddhanature in all beings, self and other. Practice for oneself is perfecting that wisdom; practice for others is causing them to hear of the this Buddhanature. Buddhanature is the life vest I referred to.
I'm not going to say what you or anyone does or doesn't do accords with the Ekayana or not. If it accords with the Ekayana, it accords with Nichiren's teachings. If not, then it doesn't. I'm just offering this to sharpen the terms of what you seem to be talking about.