@passthejoe
Sounds interesting. I guess the two services are needed to 1. start the toolbox container which does not automatically start Syncthing inside itself (no systemd in podman containers?) and that's why 2. the second service unit commands the toolbox container to launch the syncthing daemon?
I have mostly experience with systemd-nspawn containers where systemd cares about launching the services inside it. But on Silverblue I'd certainly use toolbox, too.