Ended up getting this one. A passive mixer would’ve been less to fidget with but I didn’t want to risk messing with the audio quality. And this was cheaper lol.

sounds like you are just looking for a simple line mixer. Its only 8 inches wide and $40!

https://www.amazon.com/gp/aw/d/B08BBXK8CY/ref=sspa_mw_detail_1?ie=UTF8&psc=1&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9kZXRhaWwp13NParams