The LilyGo T-Deck Pro, specifically the model with the A7682E module has the potential to be used as a dual-purpose device.
I think the version of MeshOS (at least for this model) should have the ability to use that hardware to make calls and send sms messages.
Clearly these functions would require 2 new apps, but I suggest having the Contacts app sort of sectioned out with a section strictly for phone numbers.