Maybe your best if not only bet would be to convert to a 2x / 2-, reducing the beam to the span (or a little more) of a training shell. Then you can use two decent pairs of real sculls (or sweep oars) at a reasonable speed, adjusting the gearing to what actually happens, but won't need rudders (maybe just one small one), keels or a cox that all increase drag.
My guess is the sails on a Class A generate about 10kW in a stiff breeze; so you can't expect to go fast with just your 200 (?) W.
Of course all the tough problems remain: space, getting the thing in and out of the water, sculling into a headwind, transport. Maybe you could leave a jury rig on her with at least a jib for sailing into heavy weather. Downwind she'll go anyway.
On the A Class US site, I saw boats advertised at 5-6k$; so you could do a lot worse than sell her and get a couple of K1s or a K2 or even a 1x trainer. At least in a K you see where you're going and they only need a patch of mud to float on.
76y, 188cm, 86kg, MHR 170. 3km/h in water, 10km/h on. Last 2k (1-16) 8.10@26