Update:
I tried exporting with sequence settings, however, it produced a folder of multiple files in strange formats instead of a single video file. So, I looked up the sequence settings, and matched them (format H.264, preset HD 720p 23.976) manually. It worked, but, it’s added black bars to the top and bottom of the frame. I don’t think it makes any difference, but obviously, it would be nice to have it at the actual aspect ratio. (Edit for clarity: the actual movie isn’t obscured or missing part of the frame, it’s just had extra black areas put above and below it.)
Also, the opening crawl really does look unprofessional. I tried with Blender but just made a mess of things; Eyepainter, if you’re still happy to render a crawl for me, I’ll send you the text. Originally I just used SirRidley’s crawl from LoE, but I’ll make some tweaks to it now I’ve got the chance.
Ultimately, the big victory here is that my computer can actually render a feature length file overnight!