Even the flip phones come with wifi and GPS standard. Sunbeam flips are the only ones that advertise a modular aspect for different features; however, they are simply turned off at the software (and cost $350+). I like the concept of the mudita but coming out of Poland makes me suspicious.
https://mudita.com/products/phones/mudita-kompakt/
The Librem 5 from purism (the last product link) is very interesting. Kill switches, removable battery, and the liberty version is MADE IN AMERICA...