If you plan on gearing that high then I don't think you'll be able to find a clutch bell with that many teeth nor would I recommend using it if you did find one. You might be able to have a custom one done by Mike or RRP but that's not cheap and again, for a clutch, that's just too tall of a ratio.
I'd recomend going with one of Mike's pinions, like
these. They go all the way up to 25T. I'm assuming your doing speed runs because a 1700kv motor on 6s is already fast geared normally, you're proposed setup is, well, a speed run setup.