No, we talked about it. It would be a good experiment if you can try
It would largely be a rewrite of the current Designer, rather than a simple packaging effort as unfortunately Che is an entirely different platform and does not have Ecore/EMF support - How can I add eclipse EMF to eclipse che ?? · Issue #1177 · eclipse/che · GitHub
Che does seem to offer a lot of advantages, so perhaps it's something that we can get engaged with as we look past the current incarnation of Designer.