Lamarcus Aldridge shot 20.7% in 116 3PA in his first 8 seasons. This season, he shot 35.2% in 105 attempts. Paul Millsap shot 27.4% in 113 3PA in 7 seasons in Utah. He has shot 35.7% in 428 attempts in 2 seasons in Utah.
If you are looking for someone who can block shots and hit threes, maybe you should look for a shot-blocking PF with a decent mid-range jumper and work on extending his range beyond the arc in select spots.