Frank: I'm pretty sure you would need to have a Graver Max or Graver Mach to use those handpieces. Call GRS and talk to J.B. Taylor, he can tell you if any one can.
GraverMeisters & GraverMax/Machs work on different principles- to be more specific, GMeisters operate on negative pressure and Max/Machs on positive (one sucks, one blows). One obvious difference is that if you open up their respective handpieces, one has the spring behind (upstream) the piston and the other is ahead (downstream). The throttles & handpieces are sufficiently different I can't imagine the Airtact would be adaptable to the 'Meister.
But, hey, let us know if you figure out how to make it work!