Thought this thread was worth revisiting if only for the sake of interesting conversation:http://en.wikipedia.org/wiki/Five_Tibet ... First_Rite
This is a Sadhana in (at least the 3HO version i've been exposed to) Kundalini yoga, it is quite simple physically, but fairly strenous, and in my own subjective experience very effective in terms of "energy" stuff, for whatever that's worth (probably not much). It looks like the history of it might be in question, but interesting that it is purported to be a Tibetan practice. If you read the history, if anything can be believed there it makes one wonder if it was actually a shared practice and not necessarily specific to Buddhism or to Vedantic ideas. Physically if you have done Hatha yoga it might be unusual in that the Kundalini version is usually constantly moving throughout these poses, rather than staticly holding them, but other than that the positions are all common ones.
Anyway the version of the Sadhana i've done, the only thing that I modify when I do it is the stuff about "self" that is specific to Sikh Dharma, and basically happens during short meditations between the positions. I kind of don't do all the self-affirmation stuff. Maybe that makes me guilty of some kind of mixing and matching, I don't know. All I know is I have done this Sadhana both for general energy and well being, and to rehab severe mental and physical distress and it works wonders. I don't really worry alot about how it's branded as I feel like I have gotten so much out of it's practice for years.
Since I don't have access to someone who teaches the actual Vajra exercises these are supposedly related to (that I know of at least), since these are purported to be close, I feel like the practice has a nice resonance with my meditation.
There is plenty of Kundalini taught (rightly or wrongly) that can just be "tried", and does not involve a guru-disciple relationship, particularly if you don't want it to. Personally I think that avoiding something like this because it's not "Buddhist enough" is a pretty questionable decision, it's like asking whether or not you should do Taiji something..plenty of things can be found that might technically conflict with your practice, but only if you go around looking for stuff that conflicts with it! However, all that is my own bias of course- either way I don't see the harm in doing it any more than you would harm your practice by doing Qigong, Zhan Zhaung, or something similar- both of which, also amount to about the same concepts through a different doorway. I have also done Zhan Zhaung for many years as a form of mediation and martial arts supplementation, and had nothing but positive results. I can recommend some in depth books on Qigong and Zhan Zhaung i've gotten alot out of if you want through PM also.
The only word of advice I will give you on energy stuff is that I personally would avoid anyone who talks too much about results over practice, the most authentic teachers i've been around that are teaching energy methods literally teach you an exercise, and then you do it, for along time..you shut up and do it, you don't think about it overmuch beyond the basic instructions. Maybe they will mention a bit of the purpose, but the point is to do it until YOU KNOW what the results are because they actually happen to you after a time of diligent practice, I steer clear of anyone who says they can enlighten you or give you a quick fix etc. You are (IME of course) a lot more likely to simply get nothing out of it and have it not work for you than you are to some how inexorably mess yourself up - it is not like this stuff is easy.
Perhaps if one has a teacher that says not to do practice Kundalini that is one thing, but as you say you don't, so all you have to go on is your own common sense, you know what you can and cannot do within your own practice of Buddhism presumably. I have found Kundalini to be nothing but a benefit, but your results may vary.