Yes, I did that for a NodOn pilot wire DDF. The case is more complicated for the ZLinky. There is one DDF file, the general.xml file to complete and six state.xxx.item.json files to add for the DDF to work for all Linky modes.
I can do the files one by one, but it’s a set to make it work.
If this is the method, I can do the eight PRs by following the method you explain.