I’ve seen a lot mention of splitcam. I’ll give it a try and see if that fixes the issue.
Ok, so Splitcam shows up in LightBurn! But, the aspect ratio is like 4:3 instead of 16:9. Any idea why Lightburn isn’t seeing the correct aspect ratio from SplitCam? You can see that SplitCam is displaying at 3840x2160, which is my usb cam’s res on the my laser, and in chrome, but not in LightBurn. If I pop OBS virtual cam driver, it pops the aspect correctly in LightBurn, but doesn’t display the image. 1 step forward at least. I’ll take it 
One other issue as well. When I update the overlay in LightBurn, this is what displays in the workarea.
edit: I see in my lightburn log that OBS reported a failed state.
11:29:24.878 D: “OBS Virtual Camera” “@device:sw:{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{A3FCE0F5-3493-419F-958A-ABA1250EC20B}”
11:29:25.901 W: Failed to get the video control
11:29:25.901 W: failed to find the video proc amp