Heliocoils are no match for a timesert. Heliocoils amount to jamming stripped threads with wire till it binds together and holds. A timesert actually places a new threaded receiver into the repair. When executed right it even looks like factory as the threads are brand new. as for the other question of room to drill, in a case like this you might have to eat the cost of a right angle drill and chalk it up to incredible savings over having someone else do the repair.
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