I also think Sardegna would have very few regular ERC entries. Maybe not on Ceredigion level, but not far...
Rally di Roma Capitale to me is a bit of a boring rally, very "generic asphalt rally" on generic roads. Maybe Rally1 can make a difference in 2026 and make it look more exciting, but Rally2-like cars from 2027, I don't know.
There were a couple of nice rallies in North East Italy like San Martino di Castrozza or Alpi Orientali (or Friuli), that used mountain roads generally not as tight as Monte. They had big entry lists, with foreign drivers from neighbouring countries, also thanks to Mitropa Cup. But since some years, they're not even part of the Italian championship anymore, so...

