I managed to get mine to comply by singing a song each time. My oldest loves numbers so we sang-song counting to 20 (she was about to do that as early as 11 months, which was neat). Number two mostly cares about monster trucks so we sing about that, except with an interrupt to spread his legs for the last wipes.
He is this meme with his daycare, though, and is weirdly strong. He just started daycare and I'm told they need two people to restrain him during changes, which I'm kinda proud of in a way, lol.