[Andy]

I think the definition of infielder and outfielder are intentionally vague, since in all other games besides co-ed, it doesn't really matter. Co Ed is the only game where a certain number of players have to be infielders and a certain number of players have to be outfielders. In any other game, only two defensive players are limited on where they have to be at the start of the play, the pitcher and catcher. The other seven can be anywhere in fair territory.

Looking at the defensive alignment detailed by MD, my first thought would be to allow it, but I would really need to see it as I'm having a hard time visualizing "F4 and F6 about 10 yards on the grass" and how that looks on the field.

It all comes down to umpire judgement and the team needs to realize that not every umpire may allow their defensive positioning and adjust accordingly.