Recertifying nitrous bottles?

I'm going to be restrained, since my short block is built with KB280 hypereutectic pistons. They're much more sensitive to detonation than forgings and I'd like to keep them out of the oil pan (or headers). :eek:
Also the Powershot solenoids have a small orifice that can only flow so much anyway.
I put a single Fogger nozzle on my old BMW 745i (factory turbo) with 40 hp jetting, just to spool the autobahn-sized turbo quicker. Even with that small system, I could empty a 10 lb bottle in one weekend... $36 in the mid-1990's. Probably $50-60 now :realcrazy: