re: libido after surgery, I didn't have any for at least two months just from being completely tired all the time and sensations taking a long while to come online.
re: dilating 24/7 with a chastity belt/harness of some sort, although it would be convenient and save a lot of time (and fulfill fantasies maybe) it would be really dangerous and a terrible idea I think. You're way too fragile to be putting that kind of stress on your neovagina early on, the lateral movement of the dilator would probably be the easiest way to tear sutures and get a vaginal-anal fistula happening I can think of. You'd be able to feel it's a bad idea as soon as you twist to one side to grab your phone or something just out of reach when you start dilating
Even after you're well healed I think it would be dangerous to use a dilator sized insert because you're not supposed to be moving those every which way, and if you used a smaller one for safety it's questionable whether it would achieve the same results but after a long period of time it might be safe to do it with something small and flexible just for the fetish angle, not the dilation requirement.
**edit - just realised you did say "long after recovery", apologies I missed that. Points are the same though, I don't think it would be terribly safe for a ciswoman either unless it were something small and flexible that wouldn't really be dilating.