I would recommend looking at the Qudelix 5K. You can use it as a dongle if you wish, but it's more convenient to use the LDAC bluetooth connection:
This is a review and detailed measurements of the Qudelix-5K USB DAC and balanced headphone amplifier with Bluetooth receiver. I purchased this myself but a member kindly donated one third of the cost. The Qudelix 5K costs US $110 on Amazon including shipping. The Qudelix comes in a nice...
www.audiosciencereview.com
I use my Q5K with IEMs (TxC, Moondrop Starfields, etc.) and over ear headphones (Sennheiser HD 660 S and Hifiman Drop HE-4XX). It's a mini-marvel.
Note, the Q5K also works great on PC as a DAC. The Qudelix Chrome add-in gives you full control over the Q5K including the ability to apply parametric EQ.