I like what Fallen guardian suggested. What if only the major scenes were voiced? I guess it would feel weird that the majority of lines not recorded. But it would be interesting to have that one part where you guys find out your character is revan and then all of your party meets up to discuss what happened after the leviathan and have your character speak.
Sith holocron brings up a very major point. All that trouble for voice work and lip syncing not compatible with mods like BOS would turn people away. Though, if fallen guardian's suggestion was taken into account, maybe it can be a possibility?