i know its not nearly as cool... and maybe i missed a few posts if this was already talked about.... but what about just flipping 3 switches.
assuming...
1st =off off
2nd =on off
3rd =off on
4th =on on
all switches off = 1st
flip first switch, powering sol 1 = 2nd
leave first switch on, flip second switch, a 3way to move power from sol 1 to sol 2=3rd
leaving first 2 switches on, switch on 3rd switch to power sol 1 = 4th
so up shifting and down shifting would be a logical sequence... i think a 3way switch would jump fast enough the off time inbetween shouldnt be an issue.
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