Nice work! Your plants look really happy. I think when they get to the top you should just see what they do. Stop tying them a couple of feet below the top. They may just sprawl apart and make room for the wood piece, depending on the variety.
I use the five foot cone shaped cages in my containers and my plants spread out at the top. Once in a while a big cherry plant will flip over the top of the cage and start growing back down, but it's not a big deal to me. Especially as short as our seasons are in the north!
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