Just had a look at a 2015 petrol peugeot WAT.
£6490 or €7023
Combined VRT OF €1732
Total €8750ish plus ferry, time and effort.
Less €2500 with the 2020 WAT grant
So if you dont mind a petrol you can get on the road for about €6500 and still good for ten years with the NTA.
if you are prepared to shop around in the UK, it might save another few quid.
Less risky decision with current situation because if it doesnt work the market here for used WATs is limited.