Second question first:
2) An updated Hy6 Mod 1 should be the same as the Mod 2 except for the exterior color. The Mod 1 will retain the odd grey-blue color, while the Mod 2 is in proper, sexy black. (Is my bias showing?)
1) The back will need to have its mount changed to AFi mount. I don't know if the Aptus 65 was ever offered in AFi mount, but I believe the 75 was, so there is some hope (anyone know for certain?). The AFi-II 7, 10 and 12 are, and so are the new Credo's. Leaf's Yair Shahar can probably answer this definitively, if you drop him a message. http://www.luminous-landscape.com/forum/index.php?action=profile;u=54519
Bonne chance et bienvenue!