I personally would avoid anything Manjaro related due to recurring controversies around the project leadership: https://www.reddit.com/r/linux/comments/hxpj87/change_in_man... I wish PinePhone would partner with Arch or Debian instead.
This seems desirable if you're setting up a PC, but is there really added value there if you're building a ROM image for a phone? It seems like you'd be doing a ton of manual installing and configuring anyway, since it's such an unusual target compared to a typical desktop, regardless of cpu architecture...