[JWait]

What you are asking is something that can't be done through any settings. I don't know if it can even be done with some custom coding, probably but I have no idea where you would begin.

You can make individual products "hidden but available for sale" but if the category is disabled there is no way to show other products in that category as it is disabled.

I don't understand why the "hidden" manufacturer part. You can choose "manufacturer not specified" and by doing so products listed under that "manufacturer" will not be able to be shown (as it isn't really a manufacturer).

It would help if I knew the reason for the "hidden" manufacturer and category. It doesn't make sense to me to have a product for sale and not let anyone know you have it for sale.