John my answers in descending order:
Lifting 23kg up to shoulder height can be a bit of a problem. It's not an easy lift when you are trying to slip into the dove tail saddle. However, yes you can use it portable but it would not be my preference with a 12"
I have not used that reducer but I hear it is good with APS size sensors. Though a few tell me that it is ok for a larger sensor. I would say it would be fine with the APS sensor but would be wary about using full frame with it.
Don't know about the tripod.
I found that only two focusers worked well with a big camera on the back of the RC12. The Atlas or the Feather Touch 3". I don't know about the Moonlite. My recent use of a Moonlite CRL 2.5" with my QSI showed considerable movement when used with a Newtonian. It might actually be ok for use on the back of the RC but I suspect you would need something bigger. To that end I am waiting on a Moonlite Night Crawler (heavy) to use with my RC12. My policy now with focusers is go heavy duty.
Hope some of that helps.
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