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.