This is probably a stupid idea, but I think it could work. It's pretty self-explanatory; adding a "secret exit" category on all the levels that could apply (1-T, 2-3, etc.). As for the ILs that already use a secret exit for the wr, they could just be transferred over to the other tab, labeled "Secret Exit" or something. idk, maybe it could work

This would work but I think src would add the tab to all of the ILs

I tried that with a game and I can confirm that it adds the variable to all IL's. Even if you were to make specific variables for specific levels, that also wouldn't work, because I tried that and it's not currently possible with how the site is right now. What I did do was add the variable anyways and just not submit any runs to the variable that it doesn't apply to. Sure it may look a bit ugly to have forever empty variables, but it works for the meantime. Though if you don't end up doing that, that's perfectly reasonable.