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@absurdbird
If it’s a recent system there should be a stop-cock (isolation gate valve) on the pipe going to the ball-cock (float valve), if not, as said, just tie up the ball so the header tank doesn’t keep filling.
Only drain down as far as you need, you can leave the lower part of the system full (obvs).
Refill with all the radiator valves open, running around with the bleed valve key and hope to avoid air locks.
Cleaning off the crusty pipe with wire wool is fine, get it nice and clean - if the olive and compression joint are also clean you shouldn’t need ptfe tape. I rarely use it on compression joints.
Hand tight then one full turn.