Even if you tried to force specific requirements like starter characters, level50, no artifacts, 1 star weapon, lvl3 talents, c0, it will make it so most can't participate as they have already past those requirements.
If you want a spiral abyss speedrun community: https://discord.gg/thegoldenhouse They got other stuff too
I feel like this will just be a battle between whales and f2p players making it p2w. There is also the world level being different for everyone and being able to decrease your own world level by one for a week. I think there are too many restrictions that would need to be in place to make it fun or worth while.
Just my thoughts but we can definitely build off of this.
Can we add the gliding event as a temporary speedrun category?
Something interesting we could do is fastest time to travel from Mondstadt entrance to inside the cathedral. You would have to start on the furthest stone line in the entrance. There are plenty of ways to get there so it would be interesting to see what people would do.
Edit: I tried it myself and it runs a bit over a minute