I had about 20 peers in a listing of "who likely gets something" plus the remaining welsh princes (at this point: Gwynedd, two Powys, plus Ceredigion and what hasn't been conquered of Dyfed yet: i.e. the Ystrad Tywi), the irish ones (by that point, you have three major anglo-norman lordships (Meath, Leinster, Ulster) and a few major native ones; Connaught is the only one that actually covers a province (well and Meath) - the rest of Ulster is split more or less between Tyrone, Tirconnel and Breifne, Munster between Thomond, Desmond and a few minor ones, while Leinster would otherwise have what's left of the Pale - basically the diocese of Dublin - and Ossory in the province.
Admittedly it's not 100% realistic on all points but the cambro-normans and the hiberno-normans were not universally enemies of the welsh and irish; if anything it depended on individual character and such. Plus the top-of-the-foodchain norman lords there were heavily intermarried and to some extent assimilated. Plus an Imperator Britanniae amused me from a rule of cool perspective (and it's early enough to draw in Brittany as a part of this because the dukes of Brittany are still earl of Richmond and massive landlords in Yorkshire

)