Dont know if this is possible.
Years ago I bought a large pair of Gilbow ‘duck bill’ shears in
England. I know they still make them. And I still use them. Though I
have a guillotine.
I put one handle in the vice and can use a combination of body
weight and hand control to cut metal, up to 2 mm thick, ie. ring
shanks and great for circles. I recently bought a long curve bladed
heavy pair of German aircraft offset shears. The excellent American
ones are generally too small and have serrated blades.
So put one handle in the vice and you can extend the other handle
inserted into a suitable piece of pipe. Or weld on extentions for