I had the same idea but I don't think it will work very well just by using Optane as memory. While Optane is much faster than NAND flash it still a lot slower than main system ram nevermind vram and I suspect to run big AI models well you are going to need all those megatransfers.
What may be possible is to have a two tier system. I have a cache system setup using Optane to accelerate my OS drive (m.2 NVME) and data volume (software raided SATA SSD) and it works well, makes the PC feel much more snappy:
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(Romex Software is a Chinese company based out of Shanghai BTW, they ended up making a better cache software than both Intel and AMD)
A similar 2 tier system might be useful to run on consumer software for memory where the main memory is the faster cache level with a larger and slower Optane level underneath.
But the problem is Intel and Micron have stopped producing Optane because they couldn't do it profitably. I wish they would sell that technology to YMTC, maybe they could do it profitably.