I would still have a male worker ask him politely, but firmly, to follow GMPs and explain that if there is a breach on a line you can not use the product before making a formalized complaint. The Rabbinical Counsel (Counsil? ) who is certifying you as Kosher will have contact information if you must escalate - but most of the time Rabbis are trying to help other Jews find Kosher food, so he will probably co operate. We allow our Rabbi to wear a little hat under his hair net.
Our rabbi does not like to deal with women so will ignore our receptionist (a woman) and will not walk round the factory with me (Food Safety Manager) or my QA Supervisor (both of us female) and chooses only to speak with the factory manager who is male.
I've already mentioned this in a different "bitch about your Kosher guy" thread, but I feel your pain; Given the number of women in QA positions, you'd think Rabbis would be used to dealing with women on a daily basis, but no. Our Rabbi talks to me politely, but will not shake my hand. He told me that shaking hands was the equivalent of "inviting someone into your bedroom". I thought "If that's the case, Orthodox are a lot friendlier towards gay lifestyles than I had previously imagined", but I didn't say it. He shakes the plant manager's hand twice, once for him and once for me. So I guess inviting a married man into your bedroom twice is better than inviting a woman in once (and sexism is legal as long as you claim it's religion)