Exactly. ITMs have wide bid/offer spreads while OTMs are tight. So you neutralize the position with an opposing vertical and sit on the box till expiration.Cheaper from an execution perspective?
Just FYI there are a lot of trades you can do when the risk free rate wakes up like it is now, e.g. renting calls or puts by trading the combo at even when the price of the option is lower than the cost of carry (interest rate you pay on your margin). These work best in FOPs because there is no asignment and you can trade the underlying.
I would look to trade these actively instead of trying to execute a box. Speaking of it, the biggest risk of your strategy is execution risk. If you send an order at midpoint you won't get a fill so you'd have to leg it. If you're off a couple of cents you completely ruin your return while at the same time you'll sit on your position for half a year.