I use KeyKegs as well. As far as I know, all new KeyKegs come pre-flushed with nitrogen from the factory, so there’s no need to purge them before filling. They’re technically single-use and can’t be properly cleaned, since the inner bag isn’t accessible — though I’ve refilled them occasionally myself, but only straight away with the same kombucha (before the inside has a chance to dry or oxidise).
You can fill them via gravity, but you’ll need a filling head or coupler that allows the gas side to vent freely. Many standard couplers have a non-return valve on the gas port, which traps air in the outer cavity and prevents the bag from expanding as it fills. Without a vent path, the keg won’t fill properly.
They’re designed to be filled upside down, so the bag unfurls correctly and fills evenly from the bottom up. If you fill them upright, the liner can crease or trap air, meaning you’ll get slightly less liquid in the keg. When you later carbonate or pressurise, the bag will just expand into the outer cavity unless you apply counterpressure.
This is the filling kit you want — it’s the simplest proper setup for manual filling:
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