Even though I’m the co-maintainer I’m not that savvy in pkgbuilds and thought I might ask here if you Jonathon or anyone else would be interested in keeping it updated.
Spending most of my time in Solus makes it hard too.
If necessary that is, I do publish AppImages for it and the Snap is just around the corner.
Some links for the interested one. https://mapton.org/
Given that a fairly high number of Arch users are fairly aggressively opposed to snap. I don’t think snap is a good alternative to AUR if you want Arch users to use the product.