The version in the package center is most likely out of date so it won’t have the latest integrations (including but not limited to Lutron). And from the sounds of it, you have an arm based Synology which does not support docker virtualization.
The only other option I can think of for you is if your Synology supports virtual machine manager. Search the forums here for setting up HA (I think it’s the supervised version) on Synology through virtual machine manager. If your Synology doesn’t support it, then you’re pretty much out of luck unless you can get python installed and install HA core manually.