No, this is fallout from a patchset adding exactly the rust library you suggest to use the DMA library. And despite this only having changes in the rust/kernel tree, the maintainer of kernel/dma showed up to NAK the patch just because he doesn't like the idea of rust code in the kernel.
Original Patch Set Thread: https://lore.kernel.org/lkml/20250108122825.136021-1-abdiel.janulgue@gmail.com/
Edit: Oh, I just saw your budget. This is ~$800, so maybe not.
There's the Starlite 5: https://us.starlabs.systems/products/starlite?variant=55242571612540
I've got one. It's got an x86 processor and runs standard fedora just fine, including pen input.
Though, I don't use it for much because I haven't found any note-taking software that I actually like using. I used something back in college that just created SVG pages in an HTML notebook which I absolutely loved, but I can't find it now. It wasn't open source so I'm guessing it might have just died.