I hate to be the bearer of bad news, but I'm exceptionally long torso'd as well. In fact I wear a men's medium backpacking pack despite being only 4'11".
In a road bike I can handle a 51.5cm effective top tube (with a 60mm stem), but ideally you want to be less stretched/aero on a cross bike (if you are going to use it as intended).
Most company's smallest cross bikes I've seen have an ETT of 52 or greater at the shortest. That's too big for me to ride as a road bike with a 60mm stem, much less as a cross bike![]()




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I'm also not a cyclocross expert.