Protools 6 LE on Mac OS 9!

[nanopico]

I guess the easiest solution could be to hack the Classic/Mac OS X DAE from 6 to drink from the 5.2.1 Mac OS 9 only DAE.

I tried looking into this with other versions.  I didn't get very far as I was a little swamped with life at that moment.

[nanopico]

No joy here. Literaly. The signature of a PEF file is Joy!peff

OS 9 know how to load PEF files.
The loader looks to the resource fork for a cfrg resource type to identify where code is.  It will be either in the data fork or a CODE resource.
Now an application can load code from any resource/data fork it wants and run it, but that is application specific.
This may be how the DAE is loaded, but as that is a system extension I'm confused how it would work at all.
The ProTools LE 5 you provided has all the correct things for loading in OS 9.
Not one of all the other files contains a PEF container whatsoever.
I'm going to say at this point, it's not possible.
That's just my take on it.