For TPM, the gang never has to leave Naboo. It could make an action-packed 45 minutes. Padme just decides to take the planet right back. A little dialogue adjustment. Maybe a little Sith or holograms of the Jedi.
I liked the sarcastic smart-ass Jar-Jar alot. The Gungan city would be more important. Obi stays more prominent. Boss more smartass and without the CGI spittle would be cool. Jedi help them meet the Naboo.
The Gungan battle is just a diversion. They could stand their ground until the droids just break through their lines and then retreat. Less slapstick. Jar could tell them to eat balls and then get caught in the roll.
The vid of the two stoner Jedi with the gang in ANH was pretty good. If someone wanted to find a 13-16 year old who looks like HC and a guy maybe with a beard that looks like EM... They could split-up with Ani leading the pilots into fighter battle and Obi taking Maul alone. EM in the sabre battle could be given the facial hair to match the new Obi in the same costume. I don't know how anyone would erase LN. Not showing the feet might help sell the character replacement shots.
Everyone could reach the low at the same time. Pad captured, Jar falls off the tank and captured, Obi hanging in the pit, and Ani out of power in the base hanger that he entered in some clever way before he crashed. Maybe some shots of the greater part of the droid army going back into the city as ordered. Then someone does something that distracts Maul on his com-link and it all gets turned around.
In many shots it might be simpler to recolor EM and LN with orange or red robes and different hair and things to make them look like Naboo soldiers or police and then super-impose new Obi and new Ani or place them elsewhere in the shot.
I don't know how to introduce 3PO and R2.
135 TPM/AOTC and 135 ROTS? 45TPM/45AOTC and 45AOTC/45ROTS then 90ROTS and 90JEDI? ;/