You may want to talk directly with the place mastering the spot to tape to know whether they want a square- or non-square pixel file. My step-by-step workflow would be (assuming they want a non-square PAL file):
1.) Design and animate in PAL D1 Widescreen Square Pixel, keeping everything center-cut safe.
2.) Nest that comp in two separate comps, both PAL D1 (non-square pixel).
2A.) For one, keep the original comp scaled at 100% to create a full-frame 4x3.
2B.) For the other, scale the original comp to roughly 75% to create a letterboxed version.
3.) Render out all three. You now have a full-frame widescreen version, a center-cut 4x3 version, and a letterboxed version.
If the place mastering the spot for some reason wants a square pixel comp, just create that in step 2 instead. You could also render out your original widescreen version and import that instead of nesting comps.
SD broadcast is always 4x3, so the only reason for you full-frame widescreen render would be to create an anamorphic widescreen DVD for the client, or to have for posterity. But by starting with that format, it gives you greater flexibility in renders. And by having both center-cut and letterboxed versions, your client could go with whichever they want.
Sorry, I should have posted this in the first place.
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conigs
[Disclaimer: Sometimes I am an idiot and misinterpret people's posts. I'm sorry.]