So couldn't you use a torque wrench instead?
If Im not mistaken, I think most race cars use aluminum lugs. That being said, depending on the type of aluminum and treatment (hardness), torquing an aluminum thread on a steel bolt could ruin the lug depending on the torque spec.
Knowing that the brand you have is a reputable name and a bunch of people run them, Im assuming their material selection and hardening were done properly. I think you would be fine using them.
I would first hand seat all the lugs, use your fingers until they are all finger tight, going in a star pattern, then use the socket by hand to seat them a little more, and then finally torque them to spec.
What I do may be a little more overkill than some, but at the end of the day, you are correct, you can torque them and they will be fine.
Using the impact is a bad idea because they are typically set higher than the torque spec, at least the ones I have used in the past