No worries. Just wanted to throw some alternatives your way, since I think €300 is a steep price for a 4 GB RAM tablet with no upgrade option. :) PS: Didn’t know stylus support was a thing. TIL about EMR.
Not x86_64 based, but the PineTab2 and PineTab-V are 2 alternatives. The PineTab2 is aarch64 (ARM) based while the PineTab-V is, you guessed it, RISC-V based.
Both 8 GB RAM versions go for about $210 on their website.
As far as I know, only the kernel module was open sourced and in doing that Nvidia moved a lot of stuff from the driver, to the firmware/software part of their stack instead. So you would still need those, which are not open.