Sample using a headset mic via splitter?

Has anyone tried using a wired phone headset (or the new op-z headset) with a splitter to record on the OP-1?
Would make for a convenient way to record vocals, since the onboard mic leaves a lot to be desired.

The OP-1 has a line level input, so this may not work well…

there is a fair amount of adjustable gain on the input tho so might be okay?