Oh man! I thought for sure this was going to be the solution. And in theory, it is! The virtual burner software is buggy though. Upon reviewing the disc it “burned,” the track splits are in the wrong places. They don’t align where they do in the Vegas project. Upon looking at the forums for the software, it seems as if the company has stopped responding to technical support emails for months.
I also checked out a different virtual burner called TotalMounter, which is free, and it also works, but it only supports discs up to 650 MB (74:00 of audio), and my project is 79:30.
Thanks for the suggestion though, that REALLY should have been it! I just wish Sony had included a “Create ISO” option, or the ability to render multiple WAV files with exactly the right lengths out of track splits (must be a multiple of 588 samples to be gapless).