I feel qualified to comment on this. I have spent quite a bit of time thinking about this topic and considered starting a company in this space because it is absolutely underexplored and there are things that we can do with today’s technology that would benefit us all greatly. Look up cortical organoids. If your injury is cortical (likely is), there is a LOT of hope in the near future. If it’s subcortical, that’s quite a bit more difficult. The cortex is a general computing substrate of which you have a limited supply. The neocortex is responsible for our general intelligence and the fact that blind people can recruit their visual cortex for other things like hearing. If you have excess, it can generally be put to good use. The idea here is simple: graft lab grown neocortex onto your own (grown from your own induced pluripotent stem cells). This has already been done in primates but nobody seems to be exploring it in humans. It may have been blocked by Congress or something. The real kicker is that while it can certainly be used to repair damaged brains, it can also be used to augment healthy brains as well (hence my fascination). Don’t give up hope! Happy to talk if you want to DM me.

The way people are using these things now (and the company I wanted to start) is by hooking them up to a neural interface and teaching them to do various tasks, much like a wetware biological computer. The manufacturing process is reduced to cellular biology, and you can grow gigantic supercomputers using this method. Pretty awesome stuff.