Yes, I’m a HAM, so I recognize the issue with having support for an external SMA connector on the non-Pro models.
However, could you integrate what most cell phone manufacturers do and use a standard U.FL SMD surface mount connector on the circuit board to connect to the body antenna? That way, if the antenna body or wire needs replacement, at least we could detach and re-attach it without de-soldering everything.
If it’s used to simply connect the existing body antenna to the main circuit, it shouldn’t be an FCC violation.
The units are really cheap in the normal manufacturing volumes: