...PCB version of NanoVNA-H to V3.4...easy to DIY Bluetooth connection
The recently announced (for ~ US$20) Arduino NANO 33 BLE claims USB host support:
Based on Nordic nRF52480 (which cannot natively implement USB host),
this may be a minimal hardware prototype for Bluetooth LE via USB with existing nanoVNAs,
except that dedicating the Arduino NANO 33 BLE USB port to host may be too disruptive,
so perhaps prototyping by a USB host shield may still be more expedient:
Cheap USB Host Shields are typically DuinoFun clones, e.g.
Oristo