Is there a piston extender design for this?

I want to build a dark oak tree farm that pushes the logs away from the dirt block the saplings are planted on. Is there any design that makes this possible? I've looked at other dark oak tree farm designs, but none of them provide a reliable way to collect saplings. I've modified a farm that solves this issue, but now I'm stuck with some leaves not decaying because a few logs are left behind

https://preview.redd.it/aoayuaorw9hf1.png?width=1920&format=png&auto=webp&s=ab26195d50568fa8c20f55eed2cbb83f420d5454