+1. I think Roger has changed the pickups a touch also, in conjunction with using the 500k pots (i.e., the 500K pot might have more of an impact with the modified HC's he is using now). I think he also now sources his single coils from Nordstrand (he says they are wound the same as the amazing, wonderful, perfect Seymours he used to use... I'd have to hear that myself before I would totally believe it!).
I'm with you, though, I would not recommend a current Sadowsky owner with the stock HC's to bother with this, since the Sadowsky HC's are very, very present up in the upper treble. With the original Sadowsky singles (which are a little more upper mid grindy and lower treble voiced)... maybe, depending on your tone goals.