Up front: I have never tripped on tren, and I never will. I do, however, have a great deal of experience with hallucinogens.
One of the main problems I see with this, without knowing your history/experience with tren or hallucinogens, is that, when buying "acid", you don't always know what you are actually getting. Assuming that you are not in a bad headspace from the tren, taking something mild like AL-LAD might not be too bad. If you happen to get something like 25I-NBOH, then things could go south VERY quickly; the same goes for bromo-dragonFLY. All of these are sold as "acid".
Unless you trust your dealer to have the same drug consistently, you're playing with fire. It might be a fun experience, but think it over thoroughly. Or just wait to trip after the tren cycle is over. What's the rush?