Tony, Mr Spock said it best: "I would like to think all things are possible." In this case the answer is yes. You will need to build a second mounting plate with a small hole just large enough for the jig saw blade. It doesn't need to be in the center of the plate, but should be along the centerline. Attach your jig saw using some screws and wooden blocks cut to hold the saw base tight against the plate. This installation leaves the blade fully exposed and a guard is needed for safety. I will try out a design I have in my head and if it works I will post a plan with photos. Remember your blade will be very unstable and only useable for rough cuts.