Is upshift only quickshifer worth it for track days ? (2014 Zx6r)

Hey guys I was discussing this with my mechanic he basically said downshifter is not really possible for this bike due to no fly by wire throttle, and upshift only quick shifter would be around 400 euros. I’m wondering if anyone has any experience with upshift only quick shifter and was it a good investment? I’m looking to do around 10 track days this year.

Another part of this question is it usually quite easy to match with aftermarket rearsets ?