I would feel cautious and I'd also want to know their supervisor was in the loop and that they are both aware of the potential pitfalls of moving away from the boundaries of traditional therapy. I would also want to be having a discussion about what could be stirred or go wrong with the therapist too, and have a plan for if things felt weird or unsteady. I don't think it is inherently a bad idea but needs a lot of careful thought all round, and it needs to feel right for you.