We have the same problem with DD and I just do it in short spurts during each A time. Literally a couple of minutes until she really starts wailing. I also sneak it in by holding her tummy to tummy and then leaning backwards in a recliner. It's still tummytime cuz she holds her head up, etc., but she doesn't recognize it. I'm sure this doesn't help with rolling, crawling, etc. but it's the best I can do without a meltdown. I asked a while ago and others recommended using the boppy to hold LO up and placing favorite toys or a mirror in front of them. My DD is really into sounds right now, so I distract her with noisy toys.