Multi-Domain Support (with optional translation mapping) for same company

Lets say we have a company called EXAMPLE

it has a primary domain
- example.com

that company may also have several other domains such as
- example.net
- example.de
- example.fr
- example.eu
- example.hu

It would be nice not to be stuck with using a single domain for the billing portal, and being able to have multiple for the same company.

Examples 1:
- my.example.com
- my.example.net
- my.example.de
- my.example.fr
- my.example.eu
- my.example.hu

or Example 2:
- example.com/client/
- example.net/client/
- example.de/client/
- example.fr/client/
- example.eu/client/
- example.hu/client/

It would be amazing if we could also specify a translation language for an install based on the domain.

Example:
- example.com/client/ => english
- example.de/client/ => german
- example.fr/client/ => french

Maybe introduce the "Multi domain" support at a discounted price. IE: xx USD per year or per month per additional domain?