One major drawback

I appreciate all the advice, but I think we're going to go with option 3; play the matches as a home/away series and award the six points to the winner of the combined series. While option 1 would be the easiest solution, it also has a major drawback in that it would have an adverse effect on the seeding of every member of that group in the final round as well as Das Losers Invitational.

We need to award 3 points here, not 1. That's why option 3 works best.