I am using Gimp-2.10.38 as well. That is my every day go to. I do have Gimp-3 installed along side but i don't use it much.
@Lyle. It would be nice if the Gimp team could come up with a way to run 8BF files in Gimp-3.
If the Custom Font plugin, 8BF, and ALL previous Gimp-2.10 scripts, and executables would work in Gimp 3 i might switch over.
It is nice to have non destructive layers and vector layers in Gimp-3 but not being able to run the Custom Font plugin is a clincher for me. I thought of re-writing it for Gimp-3 but i wouldn't know where to begin, and Tran doesn't seem to be around anymore. Heck i've only re-written one of my own plugins and i lost interest after that. Possibly i may re-write Chewed Text as i use it quite a bit creating Custom Fonts. I may give it a good ole Gimp Chat try anyways. LOL.
Thing is that most script and plugin authors just don't seem to either want or can't re-code their filters for Gimp-3.
You know what would be really cool is if the Gimp team came up with a plugin that would write code for you.
I heard they may be adding something like an Action something like Photo Shop, but i believe that is way down the line.
Something like that would be a great addition to Gimp-3. You could record all your steps for your own older plugins and viola! you have a new re-written plugin you can redistribute for the newer Gimp-3 versions.

Lyle i don't know if you know it or not but MareroQ has written a type of Shellout filter for Gimp-3 that calls, Inkscape, Photoshop, and Filter Forge. They are 3 separate scripts but they work well. And if you can call PS then you can use most 8BF filters.