I got an idea that might just work... I'm gonna use my phone to record the audio, and the Mac to capture my screen. Then all I need to do is try and sync them up as best I can.
Just downloaded it. Was very easy to setup, no tutorials needed. I have it set to display capture instead of application capture, but I'll likely switch to that. If I somehow forget, I can always just crop to the application window in post editing.
I also found a bug with OBS. Apparently if you hide OBS from capture, the Stop Recording button will bug out and only capture 1 to 5 seconds of video, even though I was recording for like 40 seconds. unchecking "hide OBS from capture" fixed that issue.