I'd be spending that money on a soldering iron, the S99 on AliExpress is meant to be a very good and inexpensive USB Type C iron, also get some decent solder, a cleaning tin with wire wool in it and one of the little stands, all cheap eBay/AE stuff. Realistically three good quality pots will set you back £10-£12, practice soldering/desoldering on your old pots.
This.