So I have managed to install arch linux on the eMMC and its working well. As a note to others I was unable to get the UEFI to recognise either a GRUB or systemd-boot bootloader with an ESP. As a workaround I enable legacy (BIOS) boot options in the SCU menu. After doing this I was able to get it to work with an MBR/BIOS boot partition with GRUB. Hope that helps someone.