Boot Elive on a second disk, first disk is Archlinux with systemd-boot

Maybe you've got another machine that allows 'legacy mode' and also can read the SD-card.
Then have Stable preformat it for installation (come to think of it there are machines/OSes that require SD-cards formatted as FAT).

Another option I've thought of is installing Elive to the SD-card using 'Virtualbox' and copying the install to the SD-card. I wrote a post on that (albeit using a USB flash drive) a while back.

It's just that I want to find out if there really is something wrong the partitioner when it comes to SD-cards or not.