Replacing the waste gate actuator with the turbo still in the car promises to be an absolutely miserable project but I've never tried it. I suspect that if you remove the elbow and down pipe, extend the old actuator's armature and lock it in place with vice grips it could be done.
Taking the turbo out can be a major pain due to the hard pipe assembly for the oil supply and drain. Personally, I'd order a flex hose kit to use when you reinstall it.
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