For posterity here's the affected packages as far as I can tell:
lembic
aqsis
blender
calligra
cinelerra-gg
CTL
darktable
Field3D
freeimage
gegl04
gimp
gmic
gstreamer1-plugins-bad-free
gtatool
hugin
ilmbase
ImageMagick
kdebase3
kdelibs
kdelibs3
kde-runtime
kf5-kimageformats
kio-extras
krita
luminance-hdr
luxcorerender
opencv
OpenEXR
OpenEXR_Viewers
OpenEXR_Viewers-nonfree
OpenImageIO
OpenSceneGraph
openshadinglanguage
openvdb
pfstools
povray
prusa-slicer
synfig
synfigstudio
vigra
vips
YafaRay
All deps built fine in COPR with the following exceptions:
1. Random strange aarch64 failures on some packages, resubmitting usually worked, so I'll ignore those errors.
3. kdebase3 needs kdelibs
4. gstreamer1-plugins-bad-free refused to build in COPR due to missing deps but a scratch build completed fine... Not sure what's going on here.
Overall there were not any weird issues or need to port any of them so I plan to move forward with the plan.
Thanks,
Richard