Hello,
the best way to process will be to create a custom zone, follow me step by step :
1. First go in your Main HikaShop Configuration (in Components => HikaShop => Configuration)
2. Go in your Zone listing (System dropdown => Zones)
3. When you are arrived on your listing zone, click on the New button
4. First, you have to define some name & code references and save
5. Now you can fill this new zone with sub-zone, then list all your zone except your 2 previous zones and associate it to your specific shipping method.
Hope this will fit your needs
Regards