re: They could install...
... a permanent Spacehab 'machine shop' module aboard shuttle. It would not be too difficult to remove and reinstall aboard the next shuttle flight, etc.
SPACEHAB
It's worth a try now that the age of reusable space shuttles is here to stay.
Good idea!
I know we're referring to (just [sarc]) LEO here, but this line came to mind:
Don't give me anything they don't have onboard.
-Ken Mattingly
Apollo 13 script line.
Where would we be without machine shops. ;)