Vendor specific shipping

Good day,

I need some advice how to have the following functionality on my multi-vendor marketplace website..

I would like to restrict where customers purchase products from based on the vendor.
e.g. Vendor x has their products shown on the entire site, but is only allowed to sell to India. If a customer adds one of their products to the cart and tries to select for it to be shipped to USA it will show an error “This vendor only sells products in India”.

I am not so specific if the error message doesnt show like that, but basically I want to restrict this vendor to only be able to sell to a specific country.
If this can work also using product “categories” then that is fine

Importantly, I do not want this to be by-product, it needs to be either by-vendor or by-category. I also do not want the vendor to be able to control this or see anything on their dashboard. I needs to be a completely administrator controlled thing in the WP-ADMIN backend

NOTE: I also have the DHL Express Commerce plugin installed, which quotes live rates as soon as anyone enters a location. So this functionality needs to override that.

Thanks, PicFlick

The page I need help with: [log in to see the link]