your title question ....

"Would you go to a yoga class that your T regularly attends?"

yes I would. you see the state I live in has many small cities and towns. its not always possible to avoid being part of the same activities as ones treatment provider.

for example the yoga class I attend we have people that have to drive 1-2 sometimes three hours from their little towns to attend any kind of resources like treatment providers, yoga, college, shopping of any kind, ....

I have many times attended functions and classes where this treatment provider or that one of mine was in attendance or part of the class. for me its not uncommon or unheard of for this to happen.