Laddawn.com : Force Cradlepack based on Bags per Roll

The current configurator will force packaging to be 'Rolls, Cradlepacked' based on the roll diameter (using 'bags per roll qty').  We won't have the roll qty on the new web until results time.  How will we handle this if they chose Individually Boxed but the roll diameter will be too big to be boxed once they enter the #bags per roll?  One idea would be to force the bags per roll in the results area to be within the 'individually boxed' limits.