Given what you’re looking for I think the Gustard R26 is worth a look. It has good detail but not harsh and as an R2R DAC it sounds a little warmer and organic than some single bit/delta sigma DACs although that’s a generalization and there can be overlap depending on the design of the DAC. If you get it through Amazon you have a 30-day return window if it doesn’t work out.
https://www.amazon.com/Gustard-R26-Discrete-R2R-DAC/dp/B0CPWPFXVC
You’ll need an SPDIF (RCA) digital cable to go from your Wiim to the DAC, and this Pine Tree Audio cable is a good start at $45 for 2 feet, but you’ll likely wanna upgrade that (and your streamer) at some point because it is important.
https://sites.google.com/view/pine-tree-audio/interconnects/single-ended/nexus
Just one idea to ponder FWIW, and best of luck.