No room for new throttle shaft bushing

I don't know. Unless you have some kind of arbor/ reamer that can center/ align through all the holes going across, there is no way to line up such a bushing

EDIT "I see" said the blind man to the deaf person

I think I'd be tempted to install it as in this video, after cleaning CLEAN, and then if it looks "like a problem" JB weld it