As was said above, oil cooler lines are not exposed to the same heat/thermal cycling as lines in/on/around exhaust manifolds, dump pipes, exhaust housings etc.
How often do are you planning to remove/install the turbo's???
Measuring and making the hoses will take you hours to do properly... Not to mention the cost.
Also, that orange sheithing is designed as a flame barrier... it's designed to stop a direct flame from penitrating it for a pre-determined amount of time. It dose work to insulate against some heat though.
Cheers
Justin