Didn't work - ever. First tried in the aftermath of the Norman Conquest. Margaret of Wessex married Ceann Mor. Later on Margaret Tudor married James V.
Male children, personal union, but no dynastic union.[/QUOTE
1) The Wessex line wasn't in a position to politically influence anything, so, in other words: So what? There's no common king.
2) See last part of #1.
Not exactly the same thing as the never-came-to-anything-because-she-died marrying of Margaret (what's with all the Margaret's?) the Maid of Norway to Edward of Caernarfon - which does mean any resulting son is heir to both thrones.