Just gonna revive this with some questions, don't mind me.
Some RBYers I talk with really don't like the Gen 7-8 cries and have asked about an option akin to this for a while. If need be I'd happily get all the cry files myself to at least cover that generation. I know some newer-gen people miss stuff like BW Druddigon as well but those would be harder to find...and I'd likely not be the one to do it.
I've tried to find where the cries are stored since I wanted to see how feasible this is, but it seems to either be private or I'm a dumbass. Or both, because that's very possible. So...is it feasible?