Well counting the 2 seconds it takes to remove or 10 seconds to add the header from a SNES rom, i don't see really the point to rework all the existing patches.
It's mostly an improvement in cases where the header status is not listed.
If there were some FAQ on how to remove headers from IPS patches then I might help sometime. Right now I'm still submitting Sonic hacks, I got about 10 to go. Then theres a page full of Megaman hacks I'm gonna start submitting. So I won't have time for a while. I wouldn't want to do it alone tho. I doubt anyone would. It would be worth doing tho.
If we get enough people then we'd have to section off who does what patches otherwise we'll wind up submitting stuff someone else already did.
Patch a headered ROM, remove headers from both a patched and original, and make a new patch.
I'd be willing to help with this.