You need to discuss all proposed categories with the Minecraft community. Ideally, here on the game’s forums or in their discord.

i whold speedrunn that it sounds halla fun to just open a world and die

I never understood the appeal for "death%" categories, especially when it takes a couple of seconds at most.

I'd think the super low commitment would be a draw for newer runners or runners needing some variety for a bit.

I've never understood runs that take only seconds at all. But for a lot of folks that's what speedrunning is. Le shrug