hmm…resynthesizer already runs out-of-the-box in my flatpak installation
the fft plugin needs some libfftw3 library files
liquid rescale is a bit easier only requires liblqr-1.so.0 and BIMP needs libpre.so.3
plenty others that work just by popping into ./config/GIMP/2.10/plug-ins
Do you really want to include all in a bespoke gimp-addon flatpak. What needs updating is the org.gnome runtime. Can not believe that it does not include libpre.so.3
I feel the same about that monster that is the debian gimp_plugin_registry package. Plugin bundles, a thousand curses on them.