Ghost and his camp may still be waiting for DOOM's estate to clear DOOM's verses for the DOOMSTARKS release (as an EP?) but obviously I have no inside info, it's just conjecture on my part
if the DOOMSTARKS project tanks I think your idea is great, Ghost should not let the verses go to waste. But there's a lot of artists out there who just rather focus on a new project instead of salvaging old stuff and retooling it