CC1312R: Can CCxxxx radio MCUs be programmed to function as a baseband chip (with an external mixer) ?

Tool/software:

Colleagues,

Can CCxxxx radio MCUs be programmed to function as a baseband chip with an external mixer?  Is there a way to bypass or CCxxxx 's own mixer?

I’m looking for ICs which would help me build an HF radio link. My bands of interest are 14 MHz and 28 MHz amateur bands. I like the CCxxxx devices, because they have a lot of modulation options.  It would be neat if I could adapt them to HF bands by adding an external mixer.

Best regards,
- Nick