It won't happen. You can work in EU or UK if you want it's just a paperwork admin exercise now. You would also need either UK or EU to be in desperate short supply of pilots to need the foreign nationals, which there is no short supply. Also, a shortage of pilots is easy enough to spot in the future and training pilots takes 2 years which is probably not much faster than the stupid paperwork to hire a foreign national. So it makes sense to just fund your own pilots rather than sort out visa and licenses for a foreigner.