Posting viewtopic.php?p=55220#p55220 highlighted that Fatdog gslapt doesn't have a copy of fim
https://www.nongnu.org/fbi-improved/
which supports viewing, rotating, flipping, mirroring, zooming in/out, stepping through etc. images in a terminal (framebuffer).
My notes indicate that I had to re-run the build with a --no-exif ... or something along those lines (my record keeping is poor) to get it to build for Fatdog (812), but as I recall the build is relatively quick/easy.
Perhaps another one to add to the set.