The smart actuator has a role. It can be tuned around, but I was told my a reputable tuner that you are better off with it than without.
I don't know about availability new but I was able to buy one off a used OEM turbo from one of the trusted mechanics that frequents this site for a good price. You might consider posting a WTB ad in the private seller area and see what turns up. Mechanics do replace failed turbos from time to time and sometimes the actuators are still good.
AFAIK, if an actuator holds vacuum it is usually good, if not it is always bad.