Indeed, you can just write your own custom /system.yaml file with the hyprland package (or no WM/DE for that matter). This guide describes how you can do that: https://blendos.co/install/post-install/intro/ (use the ‘custom’ track and add ‘hyprland’ to the package list)

(disclaimer: blendOS dev here)

Just the Arch repos with an additional repository (similar to EndeavourOS), so AUR packages do work as intended and are in fact officially supported.

(disclaimer: blendOS dev here)