Remember that the YJM sound comes from Dimarzio stacked singles not true singles so the high power of the Sinner would be perfect.
Yeah, but although the HS-3 and YJM have really high DC resistance (about 23K or something!), the actual output is quite low. I've got an HS-3 and it's not noticeably hotter than a normal Strat pickup.
They do seem to handle distortion a little better than ordinary Strat pickups, but I think that may be due to the lack of hum more than anything else.
Having said all that, I'm sure the guys are right that a Trilogy or Sinner would be a great replacement for your JB Jr.