Hmmmmmm.

Using a regular monitor on your lap would probably cut the circulation off lol, they are quite heavy. A friend of mine does do something similar to what you are after. She calls it her 'slug mode'.

I think the 'best' you are most likely to get is something like this, where you just slide the wheels under the couch and have the table just above your legs. I know it's not exactly what you asked for but it's all I could think of haha.

Good luck