That is a good idea...
What I've typically done with stuck cartridges, is put the barrel in the air with the stock on the ground... with the foregrip against my shoulder. Put one hand on the fas side of the charge handle, and with a soft brass malet, tap the other side of the charge handle down towards the ground... this gives me pretty good control on how hard and fast the bolt comes back...
The edges of my bench are padded, so I don't know how well that would work... not exactly a rigid corner to hook against...