Doesn't sound stupid to me. In fact, I'm thinking of doing the same swap in my '65. Same deal. Nice bike, shot motor. Yours looks nicer, though.
Fortunately, I have both a CB160 and CA160 engine. You could put a CB160 engine one there if you swap the one-carb head from a CA160.
The top of the engine fitting the bracket welded onto the frame might be different with the 160. Otherwise, the bottom half is a direct bolt in. In fact, somebody tried to put the CB160 engine that I have onto one of the CA95's my dad and I picked up. It totally didn't work with it being two-carbs.
With a CA160 head on there, you might be able to pull it off. I'll take another look at my CA160 frame and compare it to my '65. If it's the same, swapping in a CA160 engine or strange CA/CB hybrid like I'm considering would totally work.
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