So I've got a flight leaving from Rome on ChinaEastern at about 2pm, but I am thinking of flying in from London at 9am the same day on Ryan Air. Would it be possible to get the airlines to sort my boarded luggage. And just walk between the gates. Or would I have to collect my luggage, get pass customs, then check in all over again? if so, is the 5 hours going to be enough, give or take possible delays.