An older work-around I tried was to simply link to the store cupsd.conf in /etc/cups. This solves the immediate problem, and even allows viewing (not editing) a few settings in said form. It's an option for those who can't wait for core-updates to be merged (don't forget to delete it next year… :-).
However, doing so merely hides the fact that this code is broken with -c FILE by effectively circumventing the option in a very sneaky way. A step back, not forward.
Kind regards, T G-R
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