Dragsix - I like your approach. I always used a Heli-coil if one were available; and if not made my own. Your approach might be easier than making my own thread insert on odd threads.

If one has a milling machine of sufficient size, a carbide-tipped end mill works pretty well to remove the obstruction.

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop