This reminds me of my youth when we used to inflate split rim truck tires. We used to attach the air hose turn the tire upside down and turn on the air from twenty feet away in case the locking ring did not hold. Later, they invented cages in which the tires were placed before inflating so that if they blew apart, the cage contained the pieces.

I think some similar kind of cage is what you need. It should be steel with wide enough slats so you can slowly undo the compressor, yet sturdy enough that if if breaks loose, the cage won't blow to bits. You may want to check with a tire shop to see if they have a cage you can borrow. I suspect the slots may be too wide, but possibly not.

Even with the cage, I'd keep a change of underwear handy.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13