How will themes be handled? A suggestion

Hey there,
first off: nice package! Maintaining it on archlinux: https://aur.archlinux.org/packages.php?ID=44020
More and more grub2 themes are popping up: https://aur.archlinux.org/packages.php?K=grub2-theme&O=0&do_Search=Go

This leads me to the question: How will grub-customizer handle themes in the future?
Packaging convention on Archlinux (and possibly other distros) tends to put themes to /usr/share/grub/themes.
This has the advantage - if your grub is not on a separate partition/ no encrypted root - that there's a single place to load themes from.
Correct me if I'm wrong, but grub can actually reach /usr/share/grub/themes/ if there's no encrypted root and grub is not installed on a separate partition, right?

It would be most awesome to have grub-customizer:
a) Load themes directly from /usr/share/grub/themes if possible
b) Copy a theme to /boot/grub/themes or whatever if a) is not possible (and checking size available!)

Right now (in a worst-case-scenario) copying the theme each time feels redundant.