You could assign the player a 'dummy' PC with no stats. Don't put the new dummy PC onto the Combat Tracker, instead only put it into the party sheet and have Party Vision turned on in the Options. The player can then see so long as they're selected on a friendly token. Then, 'take ownership' of their character by right-clicking it on the Character sidebar menu. Now, the player can see but can't do anything on their character sheet - when they tell you what their PC does you would click their buttons for them.

I don't know if that's perfect, but it's something.