Curious. Since I am about to acquire a YH-3 and T20 RP as soon as I can get one of my evil minions down to the PO box to pick em up, I am really interested here. I would have thought that software EQing would have introduced some artifacting along the line somewhere. If that is not the case, as you measured, the and android eq program is going to be very high on my list of "must haves"
As an afterthought, if in fact this can be achieved by software then it should also be repeatable via a simple (sic) hardware solution along the lines of the device etymotic uses to EQ ER4P's to ER4S spec. This would be a slick way to go as it would leave the phones untouched for resale. Time to start digging around for the old mic's I think.