Thanks for the advice, @G650 & @Chips O'Toole. I'll look deeper at the options and resources you've suggested. Unfortunately, my space is a 12'x12' room that also has to be my office, so I have tried as much as possible to not have to dick with microphones. Aside from space limitations, its not set up well acoustically, and I have no ability to isolate anything. So it is not a professional recording setting by any means. That's why I used an Ox Box when I was using real valve amps and now use an AxeFX3 exclusively for electric recording, and I'm very happy with it.
Previously, I've used my Eastman acoustic with an LR Baggs system in it for recording and having that go direct to interface. Again, not nearly as good as what you could get in a studio with proper acoustics and mics, but good enough for me and my needs. But now I'm starting to take a shine to vintage acoustics and I don't want to go altering them with things like an LR Baggs or Fishman pickup system inside. So that's the context where I am coming from.
I guess I can have a decent condenser mic and just use headphones for monitoring to make the whole room a sound booth, basically. Which I'd need to do for either that DPA 4099 or one of the suggestions you guys have made. The DPA 4099 in that video is $650 MSRP, so its not exactly cheap, either.