@toggledbits,
Well, I took a first step. I tried using the docker-compose.yaml file with podman-compose, but it gave me some issues. I fell back on just using docker-compose, and it worked with only a minor hickup. It told me the version tag was depricated and to remove it to prevent problems in the future, so I did so, and it's running without issue. Rules and reactions are working as before, which is fantastic. Reactor on my old server is stopped/disabled, so one more item crossed off. I'm hoping to have the old server fully decommissioned this weekend.
At some point, I'll go back and try and get it running with Podman, if it's possible. I can engage their community and see if they have any advice, but right now it's more important for me to turn off my office heater going into summer.
The other major advantage is that in theory, I won't have to manually update nodejs each release, which has been kind of a pain lately.