Anyone know of an offering of a driveshaft safety loop for an A-body made like this?

Both of the above loops will not withstand a high speed drive line failure. I still use the old school flat strap style or make one out of tubing and mount it within 6" either side of the hoop. Lots of stored energy in a driveline!

I would break out the tubing bender and overbuild it unless you are doing the pro touring because it looks cool type of thing.