New to Raxda (Rock Pi 4b), not new to Linux (1.2.13) or programming (FORTRAN).
I live close to where the Alaska Highway begins, at Dawson Creek, BC, Canada. Most of my computer needs are in some sense related to farming. But since I have worked in other fields, my definition of farming may not be what your is. I will have robots at some point (who wants to prune trees?). I think the Rock Pi 4b is going to be involved in either serving time (NTP) or GPS base station type stuff (including RTKlib).
Many years ago, I ported most of Perl to QNX-2.x. I once built a personal repository of OpenWRT and built just about every package they had at the time for my hardware. The only other extensive cross compiling I’ve done is to compile gcc for a Sun from a PPro based machine running Linux (could have been yggdrasil (sp?) or Debian).
I’ve got a PinebookPro coming, which is another rk3399 device.
Most of my machines run Devuan (I hate systemd), I will try to keep my RPi type machines on as common a OS as I can. Possibly Debian, but maybe I can figure out how to leverage Devuan in that direction. In reading some forum topics, it seems that there are occassionally packages not available. I could try to set up a Debian repository here based on what you have, and try to build packages for Rock Pi 4b. I could send diffs to someone if that is useful.