Can you touch his feet without him caring? You could let him fall asleep under a blanket, then when he sticks a leg out gently hold it so you can cut the nails, hold it tight enough her cant pull away otherwise you wont get it.
With Holly I pretend I am just filing her nails and then cut the nails. I have no idea why but she is so much more relaxed with filing her nails than cutting them.
Also could try with one person holding him a position where he is relaxed and comfy, and then the other person can cut the nails
I do this with Holly when my mum isnt busy and it really helps to keep her calmer.