>>40256491I obviously do not know this girl, so my advice here is going to be pretty general.
But I would recommend that once sex does come up, find out if topping with a strap is something that she would be into. If so, then that is an easy way to handle things. Especially since you said are both into and good at oral already, so you do not need to worry about reciprocation.
If she is not into straps, then oral and getting off from how good you can make her feel is going to be your only real pathway here.
I promise you that as long as you explain your genital dysphoria before hand, then sex will be fine. Whatever form it takes.
In the past (when I have not been with stone butches), I have said that she should just pretend I'm like a barbie doll and I have nothing down there. So maybe that is something that could work for you when it comes to explaining this.