Communication only needs the brain nowadays, neuralink is shit but there are options for similar brain-machine interface that are workable for paralyzed people.

Survival is harder. Ecmo, parenteral nutrition, and dialysis are organ supplements not replacements. Lacking lungs, GI, or kidneys will kill you. Dialysis supplements kidney function. Ecmo supplements lungs that are reduced capability. Parenteral nutrition supplements reduced GI function. There are mechanical hearts/assitive devices one dude had a mech heart one for years but you still need blood pumping. The liver has no assitive device you die in 24h without.