Let the birds do it

Some of them are actually good for something besides eating after all

Woodpecker nest halts construction of TMX pipeline near Bridal Falls, B.C. | The Star

so all they got to do is go out and find flocks of nest building birds and introduce them to the trees all along the route. As many as they can get, over and over again.

So alter the environment by man made intrusion…

no harm, no foul

How do you know? Over population could kill the species…

no, not increasing, just relocating