According to my Rov, who discussed this with us extensively in a special pre-Pesach shiur, Ashkenazim who eat in Sephardic homes absolutely MAY eat off the keilim that had contained Kitniyos. They just may not eat the actual kitniyos. Kitniyos as an issur, is an Ashkenazic minhag that has become universally accepted by Jews of that descent, but it is NOT chometz, nor should the keilim be considered as assur.
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