French proxies offered to James IV OTL were either Charlotte of Naples or Anne de Foix-Candale (OTL queen of Hungary). He refused bothFrench proxy. Maybe Germaine of Foix.
Fernando el Catolico did offer such a match OTL. Mostly to get Marge out of Spain (she was useless to him after a dead daughter and he had no further son), but also to get out of having to repay her entire dowry to the new bridegroom.Perhaps James marries Margaret of Austria?