I don't think IQ is the main factor here, and an experimental physicist could bring back something interesting, but also could bring back a personal crisis when so many things he assumed have been so forcefully challenged in an experiential (instead of intellectual) way.
I happen to have interacted since I was a child with many people involved in physics research, including the LHC at CERN, as my father is a theoretical physicist and has worked there (not on the LHC or the former LEP, though). There are some very bright and open minded people that are also interested in different philosophical perspectives etc., those for sure could have some interesting things to say if exposed to these experiences. But there are also many (and I would say they are majority) very bright researchers that live their life hyper focused in their very specific, highly specialized field, without any interest in anything else. In fact I personally think many use their research as a way to escape their lives and fears. For most of those to have any good insight to offer they would need first to recover from the nuclear explosion to their reality that would ensue, and that would take years if it happens at all, as I don't think most of that type would do it again.
This is all to say that where raw IQ obviously makes a difference in understanding (almost by definition), it's not the main or even determinant factor. I would compare it with an airplane engine: a jet engine can get much farther away, must faster, than a turbofan. However without a competent pilot it won't do so, and the engine guarantees nothing about the pilot.
I've often encountered clearly brilliant people that were so conformist that would just do what a higher authority expects from them, wasting their potential. I think certain attitudes and values are the main contributors to getting close to fulfill (or not) your full potential as a human.
I personally wouldn't expect much from "specialists" as generic specialists. There are people that happen to be specialists that clearly would have much to bring back from those experiences. But it's not the being a specialist what makes that likely, it's often people that are already bringing back a lot from wherever human beings get new ideas.
So I disagree with the whole idea of a "DMT hyperspace scientific expedition" (which is where the model comes from), as navigating inner spaces is extremely different from getting on a boat and making measurements or classifying species of fish. In the latter there's a captain and a crew that do everything you need so you can do your job; in the first you are captain, crew, scientist, and everything else at once. So I think that plan is very naive. It would still be interesting to see it play out, though, but probably in very unexpected ways.