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Hi Mark- SCTs have got heaps of focus travel but do have limits. I haven’t used the 0.63x with binoviewers but use regularly with my 8” celestron cpc800 with absolutely no focus issues. I’ve only had problem reaching focus with a 36mm eyepiece and 2inch diagonal AND a 1.25mm adaptor. And then only just - but I know the binos use a lot of space. Maybe don’t worry about the reducer when binoviewing as it’s mainly used for imaging anyway.
Best to test it under the night sky. Don’t worry about turning the focus knob all the way it won’t drop off. Just don’t keep forcing it when it gets tight.
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