awesome! 750mm is on the shorter side of Newts when it comes to the effect on balancing. With an EQ5, you'd be just fine.
I personally have no experience with Alt-Az mounts at all and I don't know how good they work with 150/750 newts. I assume it would work, too, but I just don't know.
So you think you'd rather get a tracking mount for the scope setup than for the camera only?
[A sturdier mount would also make your visual sessions more delightful
]