You dont want to use a pump, it will spoil after a few days. You will want C02, and if you want low profile, you will likely want to go with cartridges. If I was size constrained, I would get the smallest regulator I could, a 20oz C02, and a 3 gallon corny. Your profile might be slightly larger, but it will be a significantly easier setup (not so much DIY) and you will be able to force carb with ease. By the time you modify everything, swear up and down about how much you hate the thing, then ultimately graduate to larger kegs, you will have spent more than going with a cheap corny setup. Another plus to the 3gallon corny setup would be that if/when you move to a larger system, you would still have all of the "small" equipment for backups and parties.
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