I was once broke and wanted good audio so have bought things incrementally. Now I have a mess of a system 🤔

I want to streamline/simplify/improve my current setup:
Receiver: https://www.amazon.com/Sony-STRDH550-5-2-Channel-Receiver/dp/B00J30GXW2 connected to both my laptop and my PC via HDMI
Bookshelf speakers: https://www.amazon.com/Sony-SSCS5-3-Driver-Bookshelf-Speaker/dp/B00O8YLMVA/r
Headphones: https://www.schiit.com/products/fulla-2 to power a pair of HD 6xxs headphones
Mic: https://www.amazon.com/Shure-SM48S-LC-Microphone-off-switch/dp/B0002D0HY4/ connected to https://www.amazon.com/BEHRINGER-Audio-Interface-1-Channel-UM2/dp/B00EK1OTZC

The desired state is a single/unified tech stack to power my mic, headphones, and speakers. Work seamlessly between both computers, and ideally lead to less desk clutter. Maybe move away from HDMI to send over an audio signal if there’s a better alternative. I would be willing to spend at most $500.