If I place him on my lap he'll immediately walk back onto my desk and lay down in his favorite spot. I can't get any work done; send help.
Edit: Sometimes in response I'll reciprocate by laying my head on him and listening to him purr while we snuggle; he's the perfect therapy cat I love him so much. 
I think you can get a life-size, human fist and forearm, made of silicon, (can't remember where I've seen them). Maybe you could microwave one of those for 30 seconds and put it in a shirt, might get an hour or two of respite.
Hmm... a decoy.
Sometimes I try to move the mouse really slowly so I don't wake him. I think the easiest setup would be a second mouse or touchpad I can use with my left hand.
You could probably do what the lap cat people do and just stuff a glove and shirt sleeve as a decoy. (They stuff a pair of pants, I’ve done that and it works well until they wise up so use sparingly!)
As long as it’s in the right place, it’ll probably work. For a bit. Might need a decoy mouse attached to it - have any old dead ones?
Unless what the cat wants is those slight movements and the “aww cmon” instant attention it gives :)
I have a small round table that's large enough for my cats bed that I keep next to my computer chair, but mine only gets up on the desk when it's the middle of the night and knows walking across the keyboard will turn it on to blind me with the monitors.
mine likes to rub her head into my mouse hand and make me click in random places
to sabotage work
