If I would buy the IEM Match, hook it up to the Sonata and hook all that up to my phone, I wouldn't have a low-profile solution. It would be just a bunch adapters and cables attached to my phone's usb-c port. It might sound great, because the IEM Match would get rid of the hiss, but it wouldn't be an all-in-one, super low profile solution.
I have a Stoner Acoustics UD110, for example, that doesn't hiss with my IEMs on my phone, but it requires a USB-C to USB OTG adapter to work and looks ridiculous.
Ergo, the conclusion; there is currently no all-in-one solution as low profile and easy as the Sonata that works with most of my IEMs, and I have mostly very sensitive IEMs.
I'm not looking for a solution to this anymore, by the way. I bought a Shanling M0 and gave up on phone audio. Totally content now.
When I feel like I HAVE TO use my phone for music, I just hook it up to my oDAC and Headstage Arrow amp. No hiss, super bulky, looks ridiculous but it sounds great.