Have not given a lot of thought to farkles. Id like to get comms in my helmet and likely switch headlights to LEDs initially.
Start looking through our tons of threads- so many options
One of the great advantages to a platform like the C14- a long lifetime means lots of products and possibilities.
And once you get used to/familiar with the bike, you will very much need to reflash the ECU- best money you can spend, period! (Although a good second place is wearing out the stock tires so you can get some decent ones).