So, I had a squirrelly idea. Supposing one could talk their local dealer into it, how about paying for an in-stock suppressor today and just have it set aside until the whole HPA thing plays out?
If it passes and goes into effect you go take possession. If it doesn't pass you go send in the paperwork and wait. Or, if it passes and suppressors suddenly become out of stock everywhere and prices skyrocket you could sell the one you already paid for and make a profit.