Best way to connect 2 bluetooth headsets to each other? RasPi as gateway?

I have 2 pairs of Bose QC35 bluetooth headsets. I’d like them to be able to talk to each other. In theory, it feels like it should be as simple as getting a RasPi, 2 bluetooth dongles (or use onboard + 1 dongle) so both can pair to the RasPi at once, then …
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