+1 on these levers from China/eBay: Shorty/Long CNC Clutch Brake Lever for Kawasaki 650R 250R 300R ER6 ZX6R/9R/10R | eBay
For less than $20 delivered, you have little to lose. They are beautifully machined, no sharp edges where there shouldn't be, and at least as good as the OEM levers for adjustability. Yes, the leverage is less - so the pull is slightly more. Your call if that matters to you. Yes, you have to re-use the OEM bushing.
As an experiment, originally wondering about the pull at the shortened end, I wrapped a rubber band around each of the OEM levers at roughly the 'short' length and tested the pull over a 100 mile ride, didn't mind the feel at all. I'm very happy with this choice.
Like all M/C parts, if you do a poor installation/adjustment job, you're likely to get less than optimal results.
For hand guards, I have BB storm - which definitely take care when installing as fitment is very fussy, but work fine. On a recent ADV trip in very rocky territory, I dropped the V several times (slow speed), scratched the plastics but they didn't move at all, and I don't regret the choice. I think every major brand is represented in the comments both for and against on this forum, but I would say if you intend to ride off road at all, any guards are a good investment.
Welcome to the journey!!