I used to trade a strategy that required I wait until the last 15 minutes of expiration and pick a deep ITM contract. Time is on your side but the risk reward ratio sucks.The problem is, if you lose one trade you end up being set back quite a bit. Most of the time taking most if not more then what the strategy sees in gains. Definitely not evergreen and the juice isn't worth the squeeze, not recommended!
You were likely buying. The OP is selling. Your point is moot with respect to this thread as the market in any of the options you're trading with 15 minutes to exp are going to express bids under intrinsic value (outside of index). The OP wants an easy convergence gain. Short call & long stock = short put. The OP should sell the synthetic in lieu of the two-way. Why synthetics matter.