Right now there are only fringe Islamic figures, with little following, even suggesting any kind of “reformation” within Islam, and some former Muslims who have written that it is not possible with Islam because too much of the core of Islam would have to be denied, which if pursued would literally invalidate Islam, not “reform” it.
The only “reformation” that is going on within Muslims is groups of Muslims in the west living a Muslim life that is sort of like secular Jews living a sort of Jewish life.
Yeah, I can’t see Muhammed Luther nailing 95 theses to the mosque door.
Either he would be hunted down and killed by the believers, or arrested and prosecuted for a hate crime.