Financial Statement using comparative when different period# in prior year data. GL9.0D (111017)

Client has changed year ends(13 periods being utilized). Have a 2011 year end 13 Periods, then a 2012 yearend is a single period, short year, then the 2012A yearend spans 13 Periods. The year 2012A Period 1 going forward needs to be compared to 2011 Period 2 to get a true comparative. This will be true for periods 1 thru 12 in 2012A. Then one month will be 2012A Period 13 compared to 2012 Period 1, then life will look normal going forward. (2013 compared to 2012A will be consistent again.)
Can I use a column spec that will enable compare to prior year plus one period?
I am thinking that I could use rolling perhaps and hide when printed all but the true comparative column?