It would be ideal if Honda made a plug-n-play OEM kit but the reason they're balking is, I'm sure, the same reason why it's so difficult to retrofit a GW cruise system. Regardless of what folks may say, a GW system CAN be retrofitted but the difficulty in doing that is so prohibitive that it's almost equivalent to saying it can't be done.
Plan B is to go with an aftermarket electronic cruise and purchase the 2015 F6B bar-buttons to operate it. Nobody would be the wiser about it not being an OEM setup. Several on the GW forums have gone this route with apparently good success; now us F6B'ers get to do it.
As for installation... why would you not enjoy the satisfaction of doing the work yourself?