multisite transposh create subsite for translated content

Hi, i have a multisite install and am working with the transposh plugin for translations.
If i add a language i can visit that by going to where NL is the country.
I would love to be able to not redirect to but to an other domain for that specific language.

I understand that i can use a iframe but thats bad for seo as its not indexed

Is there a way where i can create a new subite and include the content from or an other nice way with rewrite rules or smth which is also not to complicated to maintain?

The transposh developer is not really helpfull