Don't laugh - there were nearly 100,000 Polish Greek-Catholics who got the chop from the Polish hierarchy. There are a few Greek-Catholic priests in the USA who are ethnic Poles.
As to Sardinia, I vaguely remember that one of the irregular (=vagantes) groups was negotiating with the Church of Poland; perhaps they have succeeded to some degree.
A majority of the Old Calendarist jurisdiction that is now known as the "Synod of Milan" joined the Polish Orthodox Church in the late 1980's, including the chief hierarch at the time of the said jurisdiction, Gabriel of Lisbon. Most of them were in Portugal and Brazil, but some were in Italy.
In recent years, the "Autonomous Orthodox Catholic Church of Portugal" has split, with the chief hierarch (successor to Gabriel of Lisbon) and all the bishops in Portugal breaking communion with Poland in the year 2000, while some of the parishes in Portugal and the two bishops and their flocks in Brazil maintaining communion with Poland. Apparently, though, the part of this Church that split from the Polish Orthodox, continues to maintain some level of official contact with the Moscow Patriarchate.