I'm using WPML to translate Websites and I've used it with X as well.
And it worked wonderfully.
But now you suddenly decided to drop support for WPML Translation Management and I can't imagine why.
In more Detail:
I created a test-page, where I included a v2 text element and a classic text element
When I open WPML translation management, only the classic text element is visible.
Is there a chance you're going to fix this?
I've also tried the wpml integration you put into content editor (pro). I can create a page and then duplicate the content to translate it.
And when I change something on the page later on, the whole translation is lost and I can start all over again. Nice.