Assuming the final release has the original Dolby Stereo soundtrack, you should still be able to decode it to surround with a Pro Logic decoder, as Dolby Surround (which is the format that Pro Logic decodes) is the same as Dolby Stereo (which was actually a surround format)

For other soundtracks, I’d rather see other soundtracks synced to SSE than for SSE 2.0 to end up being GOUT synced. To GOUT sync SSE, you’d have to insert tons of dummy frames at various points, which would kill the viewing experience.