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Buy some automotive body filler, level it off and apply your covering of choice. Or else have an inch of new concrete poured.

I was going to mention that's what I had when I read your post. Works reasonably well.

Backup? I've never lived in a house that even had one. Now, the house we're moving into in a few weeks has one. If I may ask, why would a properly designed basement/foundation need one?

I've been trying to find something similar. 6 foot is as wide as I have found at the usual outlets. I know they are made because I see them in auditoriums and such. Might want to check with a commercial door vendor.