Having another think about the motifs, there is some affinity with Hind Horn in the overall plot, Grundtvig 72, and Swedish 175 The Return of the Husband which has the following versions among others:
Sir Thor and Lady Silvermor (Dan. Prior)
The Returning husband (Croat)
Husband's Homecoming (Polish)
Young Sir Thor and Lady Thore (Unge Hr Tor og Jomfru Tore)
Finnish Arts (Borrow)
Hertig Henrik.