I don't think you'll be able to apply in advance (Edit: Not at first anyway) https://www.theguardian.com/world/2023/dec/19/eu-fingerprint-checks-uk-travellers-british-passengers-entry-exit-system-fac… (View Post)
In October you'll need a visa to go to the EU (and you can't apply in advance, have to get it at the border). Then there's goods getting checked that go via Ireland next year. Maybe there will be ano… (View Post)