Hello,
I can do this only export/ import the bank from H3 to H4 and replace in project.
Until know I said native instruments do it mad, bacause I HAAAAAATE that plugins/effects,
which are not compatible with previous version as done at kontakt (e.g the name of the halion .dll name is changed, so global replacement is not can be done.
Or I know something wrong ? Try to rename halion 4.dll to halion.dll ? 
)
Until H3 simple halion.dll was enough, why not this time ? )
You can say, I could still use halion 3 and h4 together. But, what is really important ?
Do you think that more people will use still H3 when he bought the 4 than
they are currently working on halion projects, or awaiting NEW users more /btw on H5 they will in trouble also, because Iām sure that the new dll name will be anything, but NOT halion 4 ) / than upgraders ?
Regards,
Vick