There's a closed pull request on the void-packages repository

heirloom-sh: allow Heirloom-specific profiles (patch)
https://github.com/void-linux/void-packages/pull/26143

Description:
Allows administrators to bypass a presumably modern `/etc/profile`, and whatever has been dropped into `/etc/profile.d/`, by providing an `/etc/heirloom/profile`. Users can do the same with `~/.heirloom_profile` for `~/.profile`. The present, traditional behavior is restored by removing those files.       
         
Originally prepared with a manual page edit, but the body of that text was last touched by Caldera before 1996. The echo lines and commentary in the profiles is enough documentation, and very easily removed by admins/users. I'll happily amend to documenting in the manpage, if that's wanted. In that case, probably will remove the *file* `/etc/skel/.heirloom_profile`, and shorten the commentary in the other to just 'See "Invocation" in heirloom-sh(1)'; also, just have the one patch and no `series` file that way.    
      
So far, only packaged and tested for i686.