There are folks who roast coffee at home, and grind every few day's dose and vacuum seal to bring to their office. I do this too, except I haven't tried vacuum sealing part yet. Coffee itself doesn't justify buying vacuum sealer because I have a spare grinder anyway.(posted 8115 days ago)You can do double packing. One layer of bag without vacuum, but you make a small hole. You put this bag in vacuum-proof bag, and vacuum seal it. Powder won't come out to interfere the pump or sealer.
You coluld also put glycin in 35mm film canister, and put them in a vacuum jar. If you use Konica canister, there is a small airway around the lid. Otherwise, you can make a small hole.
I'm not too fond of nitrogen sealing even for wines... if the bottle is good, I'll drink it in the same night anyway :-)