So, I've spent the last few days using all the knowledge I've learned working with ArcTyr to fork OpenTyrian (again...) and finally add *proper* Tyrian 2000 support.
The source code is publicly available: https://github.com/KScl/opentyrian2000
No builds currently because I don't have an environment set up to build for Windows.
From first to last, these images are: The title screen, the Timed Battle mode that Tyrian 2000 introduced, shopping for ships including some Tyrian 2000 specific ones, and the slightly revised weapon purchasing screen.
Further screenshots: Various levels exclusive to Tyrian 2000.
I've released a version of OpenTyrian2000 now with Windows builds included!