Yeah, longtime chi kung practitioner.
I find that a chi kung practice is extremely helpful when tripping, and I do practice it quite a bit when on longer journeys... but for smoalked DMT, there is generally no time to do any real exercises per se.
You certainly move energy and can do amazing things, but it must be ingrained in you already... to the point where you can direct the chi purely by intent. Often times on breakthroughs, the idea of moving a body that you don't really have anymore is a comical concept.
With Aya and the other entheogens that have decent length of effect, I nearly always practice some. I feel like I have to do some energy work usually. If I don't I often feel stuck or blocked and the trip is not nearly as powerful an experience.
I wouldn't say that DMT or any entheogens aid in meditation as much as I would say that meditation aids in the entheogenic experience. Some entheogens do make the energy more obvious, which can be an asset for beginners... especially if you can't sense it directly yet. But I think the entheogens are more of a challenge for meditation... that you can rise to meet. If you do it correctly, you eventually have this "mental backflip" experience where you get on top of the trip... and from then on out, you are riding the trip instead of it riding you.
I am not sure if this is exactly what you wanna hear, but in general I think that meditation and chi kung are essential and that any mental journey you take is a kind of meditation and as such your skills that you have developed will pay off.
I think of it like this. Your normal cultivation is like working out in a swimming pool. Taking entheogens is like swimming out to sea in often rough waters. If anything, it makes your swimming harder... but having practiced swimming will make it easier to deal with the ocean. If that makes any sense.
"Curiouser and curiouser..." ~ Alice
"Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumored by many. Do not believe in anything simply because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find that anything agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it." ~ Buddha