Not quite the same as your thread, but looking at this and then looking at Gargoyles gave me a great idea for my campaign! >> But that's not what you wanted to hear about.
It doesn't look like RAW you could use Spell Combat with a claw and a spell, since it specifies
"To use this ability, the magus must have one hand free (even if the spell being cast does not have somatic components), while wielding a light or one-handed melee weapon in the other hand."
That doesn't mean you couldn't convince your DM to bend the rules for you, but remember natural attacks don't get iterative attacks either.
