Nitrous plumbing A1A...??..

I've seen some of those smaller fuel cells and I'm not really liking the way they will mount in some cases. And even a 1-gallon seems almost like it's going to be too bulky.... I know I can't use this in particular, but I was thinking something like this that I could seal and hook a n fittings to... My idea was something like this kind of sitting on the fenderwell that I could not only have a pressure gauge on(before the regulator) but also a recirculation from the regulator. Also some kind of quick disconnect so I can disconnect from the tank and pump it back into a little 1 gallon tank that I didn't use.... kind of leaving it empty most of the time but when I'm ready to use nitrous I can just take a little 1 gallon can and fill it halfway up... And when I'm done just pump back what I don't use...
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