Seeing as those ST variants didn’t have plugins and audio files involved (unless you were syncing it to some sort of recording device)…you could always just export as standard MIDI files (SMF). Modern DAWs will make quick work of reorganizing tracks and sorting whatever 'MIDI Effects" you might have had in play.
Inside your ST Emulator, export the project as MIDI type 1.
You might want to do two passes. One exactly as the Arrangement was last played. Another with any special MIDI effects you might have been using disabled.
If you have any special MIDI settings, program changes, SYSEX, or effects in play, those should also be ‘frozen’ into your SMF rendering (there might even be flags/settings in the program where you can make choices about this before exporting). If you don’t want those effects in your port, back up the project, disable them, and then export.
If the project has more than 16 channels, you might split it into multiple MIDI files, perhaps by instrument sections. If you have problems exporting it all together in a single SMF, try this.
Import the MIDI files into whatever modern DAW you like. Organize the tracks and connected them to whatever instrument(s) you require.