Does a speaker wire to RJ45 adapter exist?

There does seem to be RJ45–>banana plug commercially available.
I would think that you could easily use this (and the quality may even be fine for general multi room-type listening. I mean, I wouldn’t do it. But if I were hell-bent on the idea of it, I could imagine it passed a usable signal that may not be terribly distorted or full of interference), to go speaker—>this adapter—> rj45 in the wall—> Ethernet—> other rj45 end—> this adapter again—-> Sonos zone player.

The added complexity of the switches makes the concept essentially impossible from what I understand. You can’t pass an analog audio signal through a switch and out the other end without something going wrong. At some point, as I am understanding your setup, you’ll have it sharing a wire with actual networking equipment. An analog audio signal can’t be managed by a VLAN, and I would imagine both sets of equipment (audio and networking) would perform poorly at best.

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I just like having everything going into my access layer switches to avoid multiple cables going into my rack/core switch

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Easy. Just because you have a zone player doesn’t mean it has to be in the rack. Move the ZP to the zone you actually want it in and connect the speakers to it there. It’ll happily act as an rj45 to speaker adapter/amplifier/DAC/source.

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You won't be able to get any decent power output over any distance with that gauge wire.

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802.3bt standard allows for 90-100w of DC power over 100m (48V, 2a, I believe it uses all 8 wires, so it’s very near the theoretical max).

It’s a poor choice for speaker wire for several dozen reasons.

This won't help you, but you've reminded me about a project of mine that I did during covid summer. I tried to build a DIY Sonos type system, and it mostly worked! The problem I ran into was surround sound, Dolby has that shite locked down so you can't just DIY that part. So being limited to stereo I kind of gave up on it, but it worked like so:

I connected a Raspberry Pi via aux audio cable to my TV. I put a HiFiBerry amp HAT on the Pi, wired up a couple shelf speakers, and piped the audio to them. Easy enough, DIY amp and speakers.

But then...

At the same time I had the Pi running gstreamer to send the audio out onto the network. At that point, any device on my network with gstreamer installed could listen to the stream and do whatever it wanted with it. So another Pi with another amp HAT could pick it up and drive more speakers elsewhere around the house. It's pretty frickin' cool. But, again, limited to stereo I dropped the project.

I did a lot of searching, but I never did find a device that could decode dolby surround in a way that I could intercept it and manipulate the channels how I wanted. If anyone can help me out here I would be forever grateful.

Those are mounted on the wall with my access switch. The ZP100s are way too big and don't have good mounting points

But I'm planning on just going the ugly route and running the cables directly to my rack

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Running analog, powered signal through a network switch? Never seen a troll like this before.

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Going to let all of the magic smoke out. Take video !

I'm going to ditch my OCD and run everything directly to my rack... Just bought a ZP100 and ZP80 (connected to the cheap amazon amp) to run my indoor and outdoor speakers