Ecotrons is worse way, low-quality and nothing but trouble. There's A LOT more needed in parts and labour than what's included in their kit. Best path is Microsquirt. One major component is software and using it to use tune. Download both and try it out.
Check out greg737's Microsquirt EFI on Ninja 250 and Bandit 400.
https://www.ninjette.org/forums/showthread.php?t=54500
https://www.ninjette.org/forums/showthread.php?t=34208
https://www.ninjette.org/forums/showthread.php?t=92695
https://www.ninjette.org/forums/showthread.php?t=99353
http://forums.banditalley.net/suzuki...ection-project
There's also buying Ninja 250 EFi components from Europe & Japan and converting bike into foreign model.