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@skinny
I'm offing my black Bell javelin medium if anyone is keen.
And bike sizing is so hard, untill you've got a bike and got a good position on that, it's hard. From there you can measure stack and reach needed and then use that as it's transferable. For me, my bike is on the limit of stack, I can't get it any lower, but I don't need too, just. I do have armrests on top of the base bar though and the stem as negative as it will go, due to the felt integrated system.
Maybe you can borrow a bike of someone, get a position on that and then move from there. Or use your bike to measure stack and reach needed, and then move from there onto a different frame. Obviously you'd need to measurements for a slacker seat-tube, but this could be done as mentioned by reversed seatpost. And the issue will be stack. But again, you can always run a big negative stem.
TLDR. Stack and Reach are king. Not tube measurements.