Fixed Wheel touring frame advice

Very nice bike there, the reason i am looking for epecially long track ends is that i ride double fixed,and im hoping to be able to get a good amount of difference between gears on the same chain, i may take a spare chain but it is not something i want to be changing a lot.

Like everyone said, an old audax bike is your best bet, especially when they have a long horizontal drop out (of which is definitely more useful than track end - easier to take off with mudguard and to flip the wheel).