Example : England versus Scots and Welsh (I'm in a big penny pincher phase, to be honest, wondering if it's worth it to ''waste'' 100 DIPLO to accept a culture that one day will be in cultural union)
This is the only culture conversion I ever do as England. Partly for RP as I suppose it's not a terribly efficient use of DIP points.Maybe convert highlander to Scots for unified Albion.