I think direct Piefed/Lemmy/Mbin integration would be best but if they haven't created a standard format yet no reason a couple apps can't establish one to be adopted
You can find me on Github with this same handle if you need somebody to help. Normally don't have time to be active on my personal account there anymore but for this, I'll find some
Glad I only play movie crossover games on the Atari 2600