Switch a shaft from a 3wood to my driver?
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I've used the shaft out of my R11 3w several times in my R9 Supertri. It worked fine, but they were pretty close in length to begin with. I did this because I wanted to use the x-stiff shaft in the driver so I could put some full swings on it. I have 2 shafts for my current Titleist driver which isn't interchangable with the TM 3w.
As for just learning, I did the opposite, and started with the three wood, and then progressed to larger cc drivers in steps until I could manage the 460cc monsters. I still prefer smaller head drivers, my 910D3 is only 445cc.