The 20-year-old completed a remarkable comeback to win the title he claimed for the first time in 2017, after twice going off the road and trailing home last through the opening Brenig Rally GB stage in the four-player shootout.
He sealed the title in the closing 21km La Bollene Vesubie stage from Rallye Monte-Carlo, featuring the mythical Col de Turini. He was quickest by 16.3sec to take the honours by 18.1sec from Armstrong.
The Frenchman failed to qualify for the four-player shootout last year after winning the title in 2017 using a controller.
Armstrong received a stylish Anonimo Militare Chrono wrc watch. Subee 203 won a gaming rig, comprising a Playseat® wrc racing chair and a full set of Thrustmaster equipment (racing wheel, pedals, handbrake).