What do I use, well a cobbled together Gimp 3.0.6 appimage for kubuntu 24.04
and resynth / gimp_gmic_qt are definitely used. What else ? rename layers from here: Plug-ins – Funky
Big but: Gimp 2 has(had) a long history and dozens of useful scripts/plugins Gimp 3 will get there eventually. Keep a Gimp 2.10 appimage handy (just saying)
I’m not sure what OS you’re using or how GIMP is packaged for you but on Debian linux I’ve been able to install it for my flatpak via GNOME software and for my Debian repo I was able to build it from source (one of the very few things that worked for me doing that!).
I do hope it will get easier to install plugins on GIMP 3 at some point.