[flamesabers]

Any thoughtful suggestions would be appreciated.

I suggest asking her why she doesn't want you to pursue NBE unless you intend to transition. Perhaps it's incomprehensible for her to understand why a genetic male would want breasts but have no desire to transition? Or maybe it's her way of establishing her boundaries and to see how deep your desire to have breasts goes?

I don't intend to trivialize your situation, but it does reminds me of the stance some fictional women may adopt in regards to their crossdressing husbands: either he can wear a particular article of feminine clothing (panties, nylons, etc.) all the time, or none of the time. No switching between male and female versions of clothing when it's convenient.