Less “do not want”, more “cannot afford right now” 
But of course, a brand store would be the optimal solution. Thanks for the inotifywait hint, which reminded me that I already had a separate topic on this exact issue over at Wpe-webkit-mir-kiosk restart after `mir-kiosk` refresh - #2 by ogra – whoops, sorry!
That’s a tad more elegant than a forced refresh every day, will check that out. In case the watcher script doesn’t check in during the refresh, can I assume that directory/socket file metadata like timestamps is only updated during a mir-kiosk refresh/restart? (if that makes sense)