Hello,
I don't see any issue regarding a port to the Backdrop CMS. I am trying to follow the procedures outlined here to assist in getting this module ported: https://api.backdropcms.org/converting-modules-from-drupal
I now am "politely asking the current maintainer(s) if they are interested in supporting a Backdrop version, or porting the module themselves." I'll offer to port the module, maintain the module, or co-maintain the module with them (or alone, if you are not interested).
Thoughts?
Thanks,
Alex