Honestly? I think arranging just a singular song at the moment would be perfect, easy and good way to start out on developing the soundtrack that way too. Its been a couple days and I've come to the conclusion to make the soundtrack a project between various music producers/composers as it seems to very much feel fitting for the overall vibe and aura of the game.
With what I've heard of your music right now, I think the way you compose could be very potentially interesting and fun for a song being made for the soundtrack.
Have you ever found yourself fiddling around with oldschool music sound sample kits just for the fun of it? I think at least some of the music for the game is definitely going to be that sort of stuff (of course, while avoiding to sample things that could get anyone in legal trouble). I'm having a lot of interesting and cool ideas now.