The E195 and E175 both have the range. Pretty sure they have the range for Greece as well but I can't see that happening. As for Flybe I'd say Malta would fit in to their routes.
The aircraft might have the range according to the manufacturer, however fill it with passengers, luggage and enough fuel for a possible diversion away from MLA if required and you'll find such a significant payload limitation that it becomes a no-go. I think you'll find that all of Flybe's existing charter services to Greece from the U.K. are restricted from carrying a full passenger load.