Xbee3 as bluetooth dongle

I’ve got DigiXbee3 chip, inserted in Xbee SMT Grove board. In other words, it’s connected via USB.
I know that DigiXbee contains bluetooth functionality. Basically, my goal is to use DigiXbee to connect to bluetooth device, and subscribe to data from that device.
What is the best way to achieve my goal? I’ve tried to connect it via hciattach, like
hciattach /dev/ttyUSB0 digi 9600
but it does not work.
Is micropython script like https://github.com/digidotcom/xbee-micropython/tree/master/samples/bluetooth/gap_connect_discovery my only option, or do I have other possibilities to approach?

That is your best option. The other option is to use API mode.