It’s ok, I’m sure Austria and The Netherlands will have UK’s back and just veto their Schengen joining ad infinitum for no apparent reason. As for the Euro, the UK can just pull a Sweden or purposefully maintain a highly variable exchange rate so as not to fulfill the requirements for joining the Eurozone.

Alternatively, pull a Denmark and peg it to the Euro and do some voodoo with interest rates when it’s in danger of changing parity outside the agreed upon limits. (Not sure if this is what pre-Brexit UK did?)