All righty then, just ordered a Griffin SPR 5.56 can through Silencer Shop.
Spent a half an hour on the phone with them, discussing options on the different cans and what I wanted to accomplish.
As it turns out, the Griffin SPR is perfect for what I want.
The Silencer Shop was very professional, and bent over backwards to help me out with some extra flash suppressor / can mounts so I could use the can on multiple guns.
As it now looks, sometime in late September my birthday will be especially happy when this and my accompanying SBR all come in together!