The first line you wrote is exactly our product plan for Geek Out Nano. ;-)
$150? I don't know. I won't decide the price tag, it's the job for accounting and sales department.
For output wattage. I would like to take your proposal and make the Geek Out 100mW here.
So it is 50mW output at 32 Ohm, 100mW output at 16 Ohm. With more than 114dB SNR and the best class of THD+N.
That should be a nice fit with the most IEMs.