After looking at commercially available options, I stumbled across a battery powered air-pump on Ali (charges via USB C) for under $15.
Not much 'building' involved on this project - added a hose from the home brew kit, and a hair tie to suspend from scope. Sounds like a legion of mosquitos when running but seems to do the trick. Ran it for around 10mins last night at the range to test. Will have to see how it holds up.
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