r1x [1] filed a deletion request for makehuman-plugin-mhx [2]: Same as for blender-plugin-mhx. Upstream's timestamps are always that of today and I can't see major progress. There are a number of bugs reported related to plain importing of files and the only other option is a in my opinion bad designed inter-app proto relying on local TCP connection.
[1] https://aur.archlinux.org/account/r1x/ [2] https://aur.archlinux.org/pkgbase/makehuman-plugin-mhx/
