I'm seeing a second puter for audio in my future
If you're buying hardware just for audio, you might look at some old physical consoles too. My favorite at the moment is the Behringer X32, which comes in practically 3 different sizes: full desk, half desk, and 19" rack. (the two half desk versions are far too similar for me to understand why they both exist, but anyway...) It's getting replaced by the Wing now, so if you look in the right place, you might be able to pick up a used one for cheap.
The tradeoff there (ignoring contaminants from an open-air crows nest at a motorsports event), is that the physical console is a fixed-function device that will always do only that job, the exact same way every time without needing security updates that might break things...in exchange for not being able to add functionality either. If what it does do is enough for you, then it will continue to do that forever. (as long as the faders hold out in a dirty environment)
And there's a smaller X-Air series, that is essentially an X32 with features deleted until it fit in a smaller chip. Remote control *only* for those, not an option like it is for the X32.
In both series - X32 and X-Air - the processing throughout each series is exactly the same, with the same internal channel count, etc. The only difference is the number of I/O and the number of faders. The other internal channels that you can't connect physically on the smaller ones, can still be used for other things. For example, you might have, say, 4 mics total and 4 different events. You can patch those 4 inputs to 4 internal channels each, and have different processing on each of those 16 internal channels, all set up and ready to switch to with just 2 mute-group buttons or group faders...
To get from one of those into OBS, you'll either need a short analog cord to a USB line input, or you'll need to set the USB interface to be 2 channels instead of the full count. OBS HATES many-channel audio devices!
If you go with the X-Air series, only the flagship, the XR18, has a USB interface. All of the smaller ones trade that for a flash drive jukebox that is too picky to be usable. In the X32, you get both, but in the X-Air, you only get one or the other. So I'd only consider the XR18, even if its I/O is overkill for what you're doing, or an X32 variant.
And of course, a DAW can do all of that too. It's just a matter of which platform you'd rather run on.