Best way to design & distribute?

You dont have to “push” it to a device. Just create panel with all needed dashboards on your PC and use the central storage instead of the local one. Then on your device select the central storage as well and select the right panel. Every time you make changes to that panel on your PC again, refreshing on the device is enough to pick up the changes.
here a screenshot what I mean with selecting the different storages in case you havn’t found it:

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