I know where one of Sandler's homes is and have an in with people who go to the gym with him, but after 2-3 years of serious occasional idle speculation I've still never come up with a feasible (and legal) plan to get him to cut an MNR promo.
Just for the record I didn't come about this information in a stalkery manner, it's just that when you randomly learn that Sandler bought a house in X neighborhood, and so-and-so has talked to him at the gym a few times, it's only natural to start thinking "if only there was a low-effort way to get him to do a video shoutout to a couple dozen strangers who make fun of him on the Internet."