Hi folks,
First: I know about this topic from there: Multidomain mapping - editor doesn't show page preview
I’m developing a site with such kind of requirement for a client and he isn’t very familiar with WordPress, plugins and so on. Yes, I could install WordPress twice but then I have twice the support/maintaining/etc. but we want it as much as easy and simple as it possible.
So my question: As you wrote in the other thread, that plugin isn’t supported. What would it be the alternative? Maybe there is another way without the plugin? Or with another plugin?
I’m looking forward to hear from you and see some tipps from you experts 
Kind Regards,
Abhijit