MFactory makes a dog engagement "kit"...you'd just need someone to install it.
I'd recommend going with Synchrotech or SpeedFactory for the install; they're all authorized Mfactory dealers.
Regarding the fully-lined carbon synchros, something tells me Gearspeed is playing catch-up or everyone bought theirs from Synchrotech. I know for sure when I got mine from Synchrotech, it was still relatively new and Gearspeed or MFactory didn't even have it. I also first heard of the Honda/Acura full-carbon lined sychros from Synchrotech on the H-T boards where Synchrotech also stated that their carbon-moly material were the same material as Gear-X, MFactory, and Gearspeed, which was developed in 2005.