You can design your own subscription page for each region seperately instead of using elqoua's default one.
Steps are as Follows :
1) Design a Subscription page as you need with email groups field as check box
2) Create one Eloqua Form with same fields and Integrate with Fields in Subscription page
3) Use the Form processing steps -> Email Group - Subscribe/Unsubscribe, Subscribe contacts globally, Unsubscribe Contacts Globally based on email group value choosen.
4) Note the subscription list lookup id in the Email groups that you are using in the page.
5) Create one New Web data Lookup by Choosing
“Contact Group memberships” for data lookup type.
“Email address” As Data field and Save
and note the Data lookup key that was generated.
6) Use the Data lookup key and Email group lookup Ids in landing page and Test the results.
With Best Regards,