So please on top of inconsistent dependencies add to your list of potential problems also no files collision checking, no distinction between explicit and implicit packages, somewhat random order of updated packages and no transaction recovery. And those are just the major problems I put from top of my mind now. I am not saying that opkg is bad, it’s good for what it was used for in OpenWRT/Lede but it’s no way dnf or apt.
We tried to use opkg for updates for more than two years so we know those problems. And if you think that you can handle that better than us then I am saying good luck but we don’t provide any support for it.