Canonize Non-Catholics?

Nope. Not these days.  But it is worth noting that there are non-Catholics in the Roman Martyrology.  That’s because they were canonized by acclamation.  These days, the process is ordered much more carefully and the purpose is to show us what a healthy Catholic looks like.  Canonizing a non-Catholic doesn’t really serve that purpose.  That’s not to say there aren’t saint outside the visible Catholic communion.