Shoe .. great tournament ... I have a suggestion. With summer upon us (in the US anyway) and folks on vacation, plus knowing we will have many players from all over the world --- it is ridiculously hard to schedule 4 people for games. We've seen that for years in the Virtual Ryder Cup - where it takes 2 months or more to get 3 matches in.
That said ... instead of a 4 person team + 1 sub --- you may want to think of a 6 person team ... and the Captain can determine who of the 6 plays each of the matches. More flexibility would enable this to go quickly and keep the interest up.
Just a thought ... you may want to check with a few of the veteran captains.