My opinion: not really.
The custom packages can be duplicated by copying the /mod folder, but the custom firmware itself will have to be installed by USB as usual. It's easy enough to make a note of your installed set on one machine and mark the same packages for normal installation on the next machine - it also gives you a prod to prune stuff you don't need.
Duplicating the channel selection etc would mean exporting the native database - there is a save option on the hidden menu, but hardly worth it. If you are using the channeldel package to manage which services are retained that can be duplicated across as part of /mod (I expect).