I've seen a few answers that propose the OP gets their hands dirty and build a thing to solve their problem. I can't seem to find the others right now, but a recent answer is this:
What I'm proposing is a hack, involving two-sided scotch tape and splicing wires: DELL AS501 or AX510. They can be bough for as little as 5€ used or 10€ new. They're simple, one-piece analog devices with 3.5mm jack audio input and 5.5mm barrel plug 12V input.
Power supply can be a slight problem without compatible Dell monitor, but it's still relatively simple to either match a 12V/1A power supply (just watch the polarity) or to splice the cable and power it directly from some 12V source you already have (like your desktop PSU).
My issue with this answer is that the OP asked for a piece of hardware and nicely listed out requirements for such hardware. The answer provided may (or may not) work, but it isn't a product recommendation. Instead it suggests scotch tape and splicing wires.
Is such a DIY answer appropriate, when the OP is not asking for a DIY solution?
This is not a duplicate of Are DIY hardware recommendations allowed?. That question was about whether DIY Hardware questions are allowed. This question is about whether an answer for a DIY solution is appropriate, when the user has not requested such a solution.