In a normal domain/DNS scenario, you need to make sure your domain points to the correct IP. Most registrars have websites where you can manage which domain points to which domain in the DNS records.
As far as I know, SP is an electron application and if you run Plasma in a wayland session, global keyboard shortcuts won’t work, unless you enable it in the Plasma settings.
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.