That is a fantastic idea. I would suggest inputting it to Igiss in the suggestions thread.
I think all Navy patrols in Alaska should be changed to Liberty Navy Guard patrols, in addition to your brilliant double dreadnought idea, there should be LSF (or LSF Guard, if such a faction exists) patrols (since the LSF would also have an interest operating there) all over Alaska and inside the minefield.
You could also have a Corsica-Inner-Sanctum-ish array of Navy Guard weapons platforms on both sides of the Alaska gate.