Handling fiscal years in BPC 5.1

I have a client where the company has entities with varying fiscal years. The majority run Oct - Sept, but others run Jan-Dec. I had planned to use an alternate hierarchy based on a methodology that worked in v4.x. I have just gone through SAP support and found that this is not possible on v5.x. Can anyone suggest a good work around for this on BPC v5.1?

Thanks,

Jason