Sounds like a good idea, I'd be careful how you place the sprints in there though if you have the foresight. You wouldn't want to go do that the day right before it's a max day or something like that. I think subbing it on the Wednesday metcon would be ideal as that is supposed to be the hardest metcon of the week and then you have Thursday as a rest day.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."