Gefen makes a terrific Pesach ketchup, and I see no reason to intentionally use an uncertified KFP condiment in a non-kitniyot environ.
Be advised that the authoritative website www.kashrut.org has a forum which discusses the Heinz ketchup issue from an Ashkenazic perspective. It's rulings which might assuage your obvious discomfort. The son(s) of Rabbi Yitzchak Abadi assert(s) that Heinz Ketchup, even with high fructose corn syrup and vinegar, is permissible for Ashkenazim on Pesach.
The reasoning is that "corn was not around in the time that the minhag [custom] of kitniyot was created and therefore is not considered kitniyot. In addition once it's an oil or syrup and not a flour it's ok as well." As to the vinegar ingredient in Heinz ketchup, it has been determined to be gluten-free in the past.
I am merely trying to mitigate the circumstances after the fact with what was a single bottle of ketchup (according to the details you presented) from an unknown etiology, and to salvage reputations even if I do not know the people involved.
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