"Also if your plan is to cut the Sidious scenes in TPM, how would Grievous' name be established? "
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Thinking this through, this is only a problem if you don't subtitle the Nemoidians. Rebel Scum is taking the hardest path. Maybe he won't be able to make Maul=Grievous.
But in an edit where the Nemoidians are subtitled, they can name their henchman "Maul" or "Grievous" or whatever.
They can also order the final battle and cover any other beat that's currently handled by Sidious-- and it will make the movie better every time.
Making the first prequel about defeating a weak villain really hurt "Phantom Menace." ANH is about blowing up the death star. TPM is about disarming a bunch of weak trade-obsessed aliens with Asian accents. I want to see a version where Nute Gunray is transformed from a weakling to a monster-- I want to hear him yearn to bite Amidala's head off and drink her blood. Take away Sidious and these guys already look like real monsters. They just need bad-ass dialogue to pull it off.
I know Rebel Scum likes the weak Nemoidians. I'm just speaking theoretically about the benefits/opportunities of cutting out Sidious.