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In our All-Star games starters may re-enter the game once. Is there a way to have players who were removed from a game and come back in?

Here is the situation---Batting 9 players, 4 on the bench. I need to play all players at some point, but can choose to bring back in starters. Do they default as not available, or is there a way to make them available to be substitutes/bench players available?

I just tested it out, and it looks like the player you subbed for (the starter) will be available the next time you go in to make substitutions.

That is correct... once a player has been removed from the game, they will be available as a sub the next time you go to the substitution screen.