I am amazed that the regulatory authorities would approve a monopoly-fitment , where alternatives are available. Sensible legislation would make a choice mandatory.
Good God - nothing would ever hit the market if this were the case. Maybe they should mandate alternate engines as well? If you notice the market reacts to these opportunities with enthusiasm and will create options if the demand exists.
Go to an aftermarket modification shop and they will design and certify whatever you want, and you will be able to get a lot of the investment back by selling the RK gear to someone else who needs spares.
No mod is cheap, fast or easy. But at least it gives you an affordable option for the managing the costs of managing your machine. Plus, if you made the right partnership agreement, you might be able to reclaim the investment through subsequent customer modifications.
I would suggest going and talking directly to Garmin and seek their advice.