That is an unanswerable question and shows a complete lack of understanding of the definition of what Vmca is. For a specific aeroplane type, Vmca never changes and can be determined only with the flaps in the take-off position.
Since he's busy wearing out another mirror, I'll answer the "unanswerable" question. He's correct that
published Vmca never changes because its calculation is specified for certification.
For practical use,
actual Vmca is constantly changing as the aircraft goes through its flight profile. To answer the question (which IS answerable), flap position shouldn't have much effect on Vmca, ATBE. Flame away...