Dont worry about it.
Having driftwood in a pleco tank will do no harm, it may stain the water brown, and lower the pH a little, but that does no harm to a pleco.
I dont bother with plants in my pleco tanks, you need to set up the lights and water conditions to grow plants properly. And then big plecos usually bulldoze the plants anyway. So I just decorate the tanks with some rocks, pipes and driftwood and keep the light level low. Any brown algae that grows gets eaten by the plecos anyway. The lower light level suits the plecos, they are less shy, and doesn't seem to upset the other fish.
Ian