@ComradeRoe In theory, yes, HRT (hormone replacement therapy) is a potential partial solution. However, how much it CAN help really depends on the individual. There would still be no going back to the way things were -- it can't add bone mass or change bone shape. While it can deepen a female voice and give facial hair, how dramatic the effect is can vary wildly. It can be anywhere between being a pretty much normal guy who's a touch on the short side to pretty much looking and sounding permanently like a late middleschool boy. (tangentially related sidenote: that a complete transformation allows for keeping your life change a secret is why the only permanently "visible" trans people are the ones who have not fully made it work. This can be due to either inexperience in crafting an image or just drawing a really unlucky hand genetically)
In any case, last I checked surgery isn't as viable for transmen because there's a LOT of nuances to a male's bits that I'm not sure medical science has managed to replicate. This actually is especially the case with human males whose genitals, unlike a lot of mammals, relies on a complex system of organic hydraulics to function.
ANYWAYS tl;dr -- it's technically an option for this couple, but it's not necessarily an easy one guaranteed to have satisfactory results. It's very much a risk/reward consideration and whether the unknown reward is worth the time and resources.
It's definitely worth it if Akira finds the idea of having to live as a woman soul-rendingly painful to think about that anything is better than living as-is. But it's hard to say that he'll think that, so far it seems like he's still in shock over everything. (and seems to be taking it in stride)
Given how mature this story is, it wouldn't shock me if they actually discuss the reality of all this.