Cost Adjustments need to be depreciated for entire life

We have a requirement like this :

a) Create an asset from PA into FA for 5 Years in January 2010 of STL method for $ 60000

b) Cost adjustments to the above  asset for $ 12000 come in Apr 2010

Requirement :

- The cost adjustments amount should be depreciated for 5 Years starting April . So the amount of depreciation in April for that asset should be 1000 for the Addition + 200 on the Cost adjustment.

Is there  a way to achieve it ?

Since we are integrated with PA, making the cost adjustment into a separate assets of its own is not something we are interested in.

Thanks