Hey! Not MTF (yet..? stuff's wacky currently) but I do know of something that may prove to be useful.
Might I suggest yohimbe bark? Avoid yohimbine supplements, but I make tea with 3-5g of ground, shredded bark. It works decently well, moreso than anything else I've tried. On top of that, it appears to be a vasodilator--it shouldn't affect hormone levels long-term! It's effective in all sexes, too.
Effects (of tea) begin after thirty or so minutes, and this aligns with all accounts I've seen. It causes restlessness, so I'd avoid evening use.. unless that's your goal. Also, doing too much is fairly dangerous. It is preferred to stick to the lowest effective dose--though, I don't seem to be dead. Interesting..
Overdose isn't fun. It's easy to overdose on, yet hard when you actually follow instructions.. like how I didn't. Anyways.
Mountain Rose sells 8oz. of bark for cheap, but took a little bit to ship. Nothing bad. The tea actually tastes decently pleasant--earthy, kind of sweet, a bit bitter, nothing overwhelming. Can't go wrong with trying?
I'll answer any further questions to the best of my ability whenever I find the time. Also, random stranger on the internet, medical advice, all that. Do some of your own research--with the caveat that any site ridden with "ineffective" and "dangerous" for every single compound in existence is probably propaganda, and not worth considering. Hope I've been helpful! Wanted to provide an answer that nobody else would.
Else? I agree with strap-on suggestions, though it's got its downsides. Pretty much everything in this thread is sound advice!