Everyone's forgetting that 1 CGI file still exists and that's for the Star Fury model and it was used in the Lost Tales movie.
But with the CGI, whether it was rendered in PAL or NTSC originally, for the DVD's (and the 1080i Broadcast masters) Warner Brothers cropped the footage from NTSC master tapes. So the DVD's, whether NTSC, PAL or SECAM are derived from NTSC sources.
But if Warner Brothers ever remasters the series, it'll be interesting too see if the redid Crusade at the same time and just included it as B5 Season 6. The Crusade DVD's are presented in their 4:3 versions.