There is no path for this. Im not even sure you can use Cobras to go backwards for this. You are correct with GSM. You can not go backwards, only same versions or higher. You can not use DIRT because of the mismatched databases.
Is there a reason to rollback to 4.x? You are probably the first person I have heard of trying to rollback?
COBRAS allows you to move objects from a backup to a verson of Unity that's the same version or later only - no backwards. We tried the backwards capability but QA just beat me into a bloody pulp - there's too many data dependencies that have to be "cauderized" when going backwards and losing data. Going from less complex to more complex is doable (i.e. use the template to fill in what's missing) but going the other way around is brutal.
I don't know too many production applications that will let you move backwards... for instance if you try and open a Word document make in Office 2007 in Office 2000, you'll get errors. A very, very difficult problem to solve.
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