Thread:KrytenKoro/@comment-31365078-20200221061655/@comment-4370375-20200221224814

So we have at least one instance of another franchise sharing its universe with a Digimon game (Tekken/Re:Digitize), one instance of Digimon characters crossing into another franchise's universe (the Cinderella Girls thing from the top of the thread) stuff in other franchises based on Digumon (Hatsune Miku, Battle Spirits, etc) and stuff in Digimon media based on other franchises (Summon Night characters in Collectors).

Yeah, I'm thinking the Monster Hunter wiki has the right idea for approaching collaborations.