Thanks for this @Eric, I've started a DM group on Discord for this so that we can get all the styles together in one place and do a comb of them, make sure everything has what it needs to work in SLX, and then we can get the completed folder released.
Any styles that will require sprite updates (Millas, Soniclems, etc) will have to be sorted on a case-by-case basis.
Anyone who wants to be added to the Discord DM group, let me know. If you have resources to share, it will be very useful to have a chance to get everything together in one place rather than lots of sporadic shares here and there (which I imagine is what leads to styles issues in the first place, tbh!) - it's not an exclusive group, anyone who wants to join, has resources to share, or wants to get involved with helping to keep the resources up to date, is more than welcome. No amount of help with this is too small, so let me know if you'd like to be added.