Couple of things to say here -
There's already a dice object on the forums. Several of them, actually. If you'd rather use those, as they've already been converted, they're here:
http://www.alice.org/community/showthread.php?t=3460
http://www.alice.org/community/showthread.php?t=3216
Also, there's a way to import multiple objects at once with all their placements and properties intact. The method is here:
http://www.alice.org/community/showthread.php?t=3278