Agree that selling my low mileage 2012 and buying a 2016 (love the low maintenance blue color) might make more sense. But have trouble spending the $3-5K difference just to get an easier reading speedometer and OEM cruise control And then again, what would I have to amuse myself with over the winter?
I've always tried to adhere to the KISS method when making modifications to improve things to my liking. A complete "Frankenstein-ing" seems a little overboard for your goals.
It reads that you have two things you are trying to accomplish here with the cruise and easier reading speedo. While I have only ridden my own '14 with the cruise control, I know that adding a aftermarket unit is a popular modification, across many makes of sport-tourers. Is there any real advantage to having a "factory" version in regards to function?
One obvious thing would be that you don't have to do the work involved with installing a aftermarket one into a tight area. But if you are considering swapping the entire electronic control package and possibly fairing to accomplish this, I would think an aftermarket install would not seem daunting to you.
Maybe someone who has owned both aftermarket and factory cruise versions can give some insight. Or, possibly someone who has a aftermarket version would let you try theirs on a meet-up to see if it would work for you.
As far as an easier to read speedo, could a change in contrast be the thing that corrects the issue?
The above pre-made one is in K/pH, but it is really nothing other than a vinyl sticker. A lot of sign shops would be capable of making whatever you wanted for your own custom version.
This would still provide you with an opportunity to disassemble your dash for your winter project without having to figure out what wires need different connections to make everything functional again.