MJ, I think for a project this large and complicated, the manufacturer themselves are the ones to do the job. They have access to the original sample data, and the arps and loops in the M3 (it's their copyright, actually), so they ought to be the ones profiting from it, I guess...

They also have access to the sample decompression routines inside the PA (their ROM is probably compressed 2:1, so you would get double the samples compared to a straight sample load), and other parameters probably hidden from the general user...

The thing is, the product needs to be commercially available. That's the only way the arranger is going to make a resurgence, IMO...