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Someone already has :) It's called CXL. Both Intel and AMD are diving head first into it for servers. Apple would just need to support it...

That's an interesting idea. But do you actually need to go all the way to making the extra memory appear as a contiguous part of the system memory? I am thinking about CUDA unified memory and perhaps some parallels to your idea.

The number of applications that are likely to use the extra memory is probably pretty small. So if you have some sort of framework that those developers can integrate into their software, you've probably done everything you need to do.

You could use them as some kind of swap or ram disk, but I don't believe as normal RAM would be possible due to how CPUs work.