Karl, looks like your alternative 256 gear would still have you above 175 at 5800... if you have an alternative gear set I would bring them...
As a thought, 26 in tall tires would give you a 244 gear, and probably be easier to change unless you have a quick change.
When we change to a class that we need to long course qualify in, we always initially gear for the quarter number.
Of course you may be over worrying, I suspect you will both be able to A license at the meet