I spent years testing mobile podcast setups on GrapheneOS and every option failed: Bluetooth earbuds have terrible mic quality, wired splitter setups are tethered and clunky, and USB-C wireless mics like the DJI Mic don't work for calls because Android won't route audio back to them.
The solution is the Yealink BH71 Bluetooth headset with its 4-mic beamforming array. Simplicity beats complexity for mobile content creation.
If you know of something better, please share!