I'm not so sure. Simpler anti-tank weapons, such as the German 13mm rifle and 37mm anti-tank gun, were based off established weapons and concepts, yet they could not be developed in time to enter widespread service. So I don't see why a more complicated weapon (which would probably suffer from poor range and accuracy) could be fielded any sooner.
Besides, in WWI tanks were vulnerable to all kinds of weapons. With luck, ordinary machine guns and field artillery could disable tanks. And still, they were undeniably successful. So adding a new weapon into the mix wouldn't cause any radical alterations in my opinion.
All these were designed for use against various fortifications, and then adapted for use against tanks. So if shaped charges were becoming common weapons for use against fortifications, they would make things more dangerous for tanks. And a lot of new weapons technologies were introduced in the war - flamethrowers, rifle grenades, gas warfare, the revival of mortars, the revival of body armor, and so on.