The problem is that the two major hormones compete with each other.
High E will suppress T and vice versa. Your Endo is more qualified to explain this better than I am, but I think you should discuss this with the therapist about WHY you want what you want. The reason I say this is because you are trying to do two opposite things at once, and adding herbals, other medications, and such is just going to throw the whole system into chaos. STOP IT.
Estrogen causes E.D. Finasteride affects the 5a-reductase enzyme, which affects estrogen, progesterone, and testosterone. You want to live as a woman, but please your wife as a functioning male. I think you need to figure out what your goal is and let the doctors prescribe the appropriate treatment.
I also think that having both a female body able to perform male sexual acts may not be feasible through hormone treatment. If you and your therapist agree that this is the path you wish to follow, then I would suggest surgical treatments so that your male hormones can get back to work. Opt for breast implants and hair transplants and whatever other feminine traits you wish to adopt. My concern is that in your efforts to achieve your goal, you could be taking some dangerous actions. Messing with your endocrine (hormone) system can have serious health effects. Hormones control so much more than just sex characteristics. I am afraid you are playing with fire trying to DIY.
Please talk to your therapist AND your doctors so that everyone knows what your goal is. That way you don't have one doctor thinking it is this and another thinking it is that, and both are confused about what the other is prescribing. Please do not take risks with your health.
Hugs!