Fadal 88 to 88HS conversion, is it possible?

Fadal used to offer factory rebuilt machines, and so far as I know they would upgrade the control when they did it. Outside of fadal I don’t think anybody has done it.

I think the most economical choice would be to leave the controller alone and drip feed the machine. I do this all the time on the fadal 88 control, no problem with it keeping up even on complex 3d parts.