There are lots of switches out there and any would be better than daisy-chaining a preamp unless you spent a lot of money on it.
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Please take a look at the Chase Technologies RLC-1 Remote Line Controller. These can be found on e-bay, often for less then $50. The unit has four inputs, no phono, and the remote is a gem since you can do volume, balance, bass, tremble etc. It also has switched power inputs so you can turn on the attached units. I have two of these in some of the systems I run, one with mono block tube amps. They have been going for over ten years with no problems. Sound quality, amazing.