Stop the press... I was wrong about no displays being 1.422 I think.

I just looked in Premiere and PAL widescreen is indeed 720x576 with a pixel aspect ratio of 1.422

Seems like my math was spot on though

So it seems like yes, all is good, you just need to bear in mind the pixel aspect ratio for PAL widescreen is 1.422

Sorry, never used widescreen SD before, wasn't aware that they just adjusted the pixel aspect ratio not the resolution.