I have soaked them in water (still in the cryo) for an hour, that will be enough, that from there to the fridge will allow them to thaw out completely. As long as you can get them separated, there is nothing wrong with putting partially thawed racks on a smoker.
If it is just a day, I cook both racks until done, wrap one with a little apple juice and sauce (it that is your poison) then foil and store over night. You can even reheat them in the oven the next day (300F for 40 minutes or so, or grill them, broil them whatever). I tend no to refreeze meat, but, that is a personal superstition.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."