I plan on making two demigod adventurers to breed in a fort, is this insanity or possible
That is entirely possible, even easy. Well, assuming one demigod adventurer is female and the other demigod adventurer is male.
Look mister I have gone down that path and let me tell you it's not easy, also gaydar works in adventure mode.
and they tend to get the -not interested- set of occupation, on top of having no interest or likes to have a starting point or uhh personality which is kinda needed for making friends in fort mode naturally.
and boy howdy I still couldn't figure out how to get those adventurer's to breed with out changing one into a pet to bypass the marriage checks to trigger the pregnancy timer then switching them back to the original race.
and all that work led to a catdwarf baby who got mauled to death by wolves. God it's been 5 years since Olon Toolpalace was born.
you could test if it's possible to just bypass marriage use gm-editor and transfer all the good genes into the mother and trigger her pregnancy thus you can just play god with one adventurer than just 2 and waiting out in a bunker filled food. though last time I read about breeding is that it only effects appearance and not attributes so that dwarf baby still has to work out to be stronger than their parents and even then those parents can't give their children the hidden skill of READING thus doom to be super strong but super illiterate while the parents go on a honey moon to read necromantic literature and control even stronger and limitless undead who get a straight up Stat boost to what ever natural abilities they have. in other words...
I plan on making two demigod adventurers to breed in a fort, is this insanity or possible
IT IS BOTH!
look going down this path will lead you to my life. filled with experiment after experiment in adventure mode never ending; quest will mean nothing to you, peasants will soon turn into fodder, you start to enjoy all the quirks and random rarities that pop up in your encounters than be mildly annoyed about them go out of your way to cheat out one super strong adventurer to just explore the world and avoid having to reanimate the dang corpse over and over and over again only to look deep and realize why not control them.
Then the necromantic horrors start, then soon you be starring not in DF acsii but GM-editor acsii and then ...ehh you might be a better coder than I am and make cool stuff so ehh go for it. though try getting cross breed adventurers to work, the only recorded chance of that happening was with an fire imp and a dwarf, but beware that looking into cross breed babies tend to be hella glitchy and crash the game if you save and reload the game as DF doesn't know how to reproduce what ever the god living hell you made.