The process was as per the previous optimisation exercise but this time nailing down the frequency of the C note (130.37Hz, which corresponds to C in ET based on A 110Hz). I've also shown ET, which doesn't look too far out of place, i.e. ET is not that much farther out of tune (compared to Just) than some of the other keys. All the thirds are closer to JT than the ET third, but three out of five of the fifths are more in error. There will be key colours, but less extreme than ET compared to JT. Whether this approach would sound sufficiently better than ET to be worth the effort (given that other keys will sound much more out of tune) is open to conjecture. It would need a wiggly fret implementation.