Why not see if someone can guest you in at T5, seems so much easier.

I would only be tempted to do this if landing on a T1 domestic as flight connections then dumps you out into T1 with no security check and you can walk to T2.

BTW do NOT even think of using the Servisair lounge in T1, I have no idea what the T2 lounge is like but it has to be better.