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Take a look at this:
https://www.privacyguides.org/en/android/general-apps/
Shelter is recommended over Insular and Island as it supports contact search blocking.
When using Shelter, you are placing complete trust in its developer, as Shelter acts as a Device Admin to create the Work Profile, and it has extensive access to the data stored within the Work Profile.
I also remember starting with island but changing to shelter because it supports app pausing without using a third party proprietary app to pause work apps
I have a couple of nodes we take on our hiking trips for emergencies or when we split up and it works pretty well. It has a surprisingly good range with the right antennas.