What's to stop a premier league team having their feeder club in another country?
Not much it seems, with the Belgian team, Royal Antwerp being Man Utd's feeder club. A quick check of their wiki page (I know, not the most exhaustive place to search), shows 31 players loaned to them over the years (including: Simpson, OShea, Wallwork, Chadwick, Ebanks-Blake, Evans, Cathcart, Shawcross).