If you wanted to try hard enough to make it work you can get all 6 of you, set up your two teams and when you search set your batting to Hall of Fame and your hitting to all star or legend and then hit search at the exact same time keeping the skill slider as low as possible.
This will basically rig the matchmaking to put your two teams together.
It's [censored] horrible you have to do that but that's how SDS built the game.