From my perspective, this is an important part, you clearly have a sense of responsibility for your partners, and you know you'll be keeping an eye on them.

If you had serious doubts, you'd probably not be exploring with them, so odds are, everyone will be fine.

But that's something you will assess during your adventures.

So, assuming all is going well (if not, you'll make adjustments as you go) -

As the Metashaman indicates - absolutely.

I consider DMT / Changa a very important part of exploring with other substances, such as Psilocybin and LSD, among others. If I'm spending that kind of time, I want to combine the experiences. As you say, you don't need breakthrough doses. Start small, explore, stay comfortable, wander around - mentally and physically - there can just be so much to experience. Very worthwhile.

Good luck to you and your gang, I hope you are able to make the most of it.