Bingowings said:

It might be possible to replace Yoda with another character in the few instances where a character in an essential scene is necessary for reaction purposes.

He could also contact the other Jedi as a disembodied telepathic voice from a hidden area for the duration of the PT (like Vader does to Luke in ESB).

Sounds like the hologram trick.

Queen of Naboo in makeup? Admiral Akbar with a brief report of the galactic military situation? Senator Mothma?

Qui as another disembodied voice? Sends Obi to Yoda?