Once I've done all and sorted all, I'll post it up in detail, but it won't be an easy or cheap end process. This is less a mod than building a headphone from parts that need custom fabrication and unlike say, a turned SFI housing, the peculiar shape of the AMT driver makes things tricky.
I very much doubt that Precide will sell the drivers seperately, although I have not enquired of Sugden. If they do they will not be cheap, the magnet coating issue is also something that fundamentally should not be happening and may or may not have been corrected in the time since the headphone was first released (mine were an older example to start with and the problems with the version1 Aulos speaker design were rectified.) Fortuitously, if one is careful, it does not mean the crippling or the death of the drivers. If you did get a set of the drivers you'd also have to build yourself one of the notch filter/impedance matching boxes that Precide supply with the headphone and I seem to have lost the specs for the parts in that. You might be able to read them from the photos I took for the review way back when. Its just a couple of capacitors and coil and a resistor. I'll be building my own one out of better parts once the headphone is finished because I don't want to be lumbered with that damnable Hirschmann connector when we have XLR these days.