Hi there, welcome!
This thread has some information about fractional scaling and reports of it working on a Clear Linux installation with Wayland: Does Clear Linux support fractional scaling? How do I turn it on? .
The command to install swupd directly to a path will work. update-grub won’t work without a manual entry because it assumes different paths in /boot. You’ll want to manually add an entry to GRUB for Clear Linux and maintain it with updates, or have GRUB chainboot systemd-boot, or have both bootloaders installed seperately and use your system EFI boot menu to flip between them.