Anything based in EU would have to be a new business unit with 9H- OE- registered airplanes.
Alot of complexity but possible. As the first waves depart UK the EU units arrive in UK but would you like to depart UK at a civilised 10:00am time but your return is 06:00am so checkout hotel at 03:00 when they say vacate your room by 12:00 the previous day?