Try getting a "NATIONAL" ATPL from a JAA state. For a UK CAA one Redsnail is correct (or was recently) if you have 3,000 hours TT in command of a jet weighing 30 tonnes or more in primarily international or similar operations you can get a UK ATPL with a couple of exams and a Sim check. Officially Redsnail is correct saying it is for G-reg aircraft only, BUT EU law says one EU state should still accept another’s "National" licence!!! Been there & done that.
The other options are Ryan Air with an Irish validation / or maybe national licence - not sure which you get but they take ICAO ATPL's with 737 time or a Swiss national licence but you need to be sponsored by the airline, some Turbo prop outfit in Basle was looking for ICAO ATPLs the other week!