It seems pretty obvious that time-scaling should work - just speed up the operation of all parts in the same proportion. A good bet is probably size-scaling, adding more parts (e.g. neurons) in the same proportion in each place, and then searching in the space of different relative sizes of each place. Clearly evolution was constrained in the speed of components and in the number of parts, so there is no obvious evolutionary reason to think such changes would not be functional.