Remember though, if it’s the worst case scenario of no deal, we (UK nationals) will lose our rights to live and work in the EU. I imagine in time a visa system would be set up but I fear it’s likely to be a long and costly process. It will also be dependent on the EU airline sponsoring you. Knowing how airlines operate I do fear us Brits will be at the bottom of the pile of applicants, behind all those from the other 27 countries who are ready and legal to work in the EU immediately.
With all that considered, I would second getting a Irish Licence as you can gererally speak to a real person should there be any issues with the transfer.
Good luck