Not only does boom length change but so does element length and spacing. I'd have to generate a design to see if the dimensions of a 'cut to channel' antenna design for real CH-6 has enough overlapping element spacing to justify such an extreme mod...
If I was in need of a high gain L-VHF Yagi, I'd expect to build from scratch. But still, you propose an idea that has enough merit to make me file it in in the back of my head in case the need comes along.
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