HackRF is only half-duplex, and the turnaround time isn't fast enough to fake it. You'd need two.

It's going to be cheaper and easier to just buy a radio that can do full duplex -- the LimeSDR costs about the same as a HackRF, and is nominally supported by OpenAirInterface.

HackRF clones cost much less, and there is no LimedSDR clones AFAIK.