My reference to troll-ism is because you're bringing up scenarios that are too far-fetched to be realistic. Six or seven times? I've never seen anything even remotely close.
By rule, you can call a strike on the batter for leaving the box (assuming the exceptions others have cited from the rule do not take place). If the coach wants to accept those strikes, so be it. If you really wanted to pull out the forfeit card because of the game delays, nobody could argue against it. You might even be able to forfeit since the coach is willfully violating rules. But those should be last resorts.