Well, my A080 and the subsequent modifications didn't work out like I'd hoped, but I did discover some new devices available since I'd last looked through the DH Gate site over the summer.
Here's a device similar to the A080, but the rings have been rolled to be more flat, and the cuff has an integrated lock, and a shaped flat ring:
The C274-1
And here's a similarly sized device, but with a solid tube. Note the open cage end that would certainly be easier to keep clean than the CBxxxx style, or the Steelworks closed tube style.
The C272-1
Both are 304 stainless. In hunting down these devices, I ran across them elsewhere, and the sizes seem to be about the same as the A080 (1-5/16 inside diameter, and about 2-1/4" long in the cage (i.e., not counting the ring).
I'm pretty sure that these were not available 6 months ago, so I don't expect that anyone has tried these out. I don't see any reviews for them, which also makes me think that they are pretty new.