I think dimok was talking about possibly doing something similar to that in another thread the other day.the problem with that is that the native wiiu os fat module doesnt have any caches so for every file it loads from the table it has to get that file table again from your drive, the only way to work around that would be to actually implement a custom fat module and do raw reads from devices and until that it will be a looong time if it ever happens at all.
Something like replacing the fat module that nintendo uses to libfat? I'm not going to pretend the in's and out's of it but it sound's good if hr decides to do it.