I have not thought about it in that way. I have been rebuilding them on a turn around basis for years. Looking at what parts are NLA I'm thinking exchange or turn around is the best way forward.
The shift housings have either plastic or thin steel backed bushing. These wear and the shift rod wears into the housing. Finding the OE bushing is hard and if housing is worn they won't work. By boring the housing to accept a new easy to find .625 oil-lite bushing and flipping or replacing the rod lost motion is greatly reduced.
Installing a grease seal in the forward opening ( kind of like the Inno shifters ) stops trash and water from getting at the forward bushing. I keep new and rebuilt shift eyes. The ones I rebuild use a slightly harder alloy for the shift eye bushing. This also removes free play.
The shifter housings that have been converted to a quick shift at some point in their life have the pins removed and the pin holes tapped. Some have had a little grinding done to clear the shifter. While I'm no fan of quick shift kits I would set up a couple to get rid of the parts. It is common knowledge that anyone can shift a mini faster than the synchros can deal with. A more correct name would be short shift, just less travel between gears and if you respect the synchros, should be fine. Also the MSC kits have a chrome shifter. With shifters NLA could be a solution.
I would also consider exchanging just the housing and shift eye as they are the parts I have to machine the balance is just clean up, paint and assemble. Shoot me an e mail ( info in profile ) and we can work it out. Steve (CTR)