It looks like the sound card doesn’t support this, but I would like to temporarily remap my headphone jack for use with a microphone. Is this possible?
On which device?
That might get tricky if there is no killswitch for the audio out port.
The Librem 13 version 1 (L13v1) supports a microphone via the 3.5 mm audio jack:
It seems in most Librem 13/15 versions there is no hardware support for a microphone via the audio jack.
Further discussion can be found in this topic: