You may look into this by contacting the Lounge. In other airports, as long as you have a boarding pass, you should be able to clear security, if they ask, advise them you are going through to use the lounge. Just ensure you have enough time to exit, transfer to your terminal, and clear security again. Again, this scenario would only work if you have carry on baggage, and if you have check in baggage, the check-in time greater than 3 hrs may not work.