Change calendar on budget

Our budget was originally implemented with an incorrect calendar and this is not something we can change after it has been used. The budget was configured as a YTD budget. We want to correct this issue so the budget will reflect a Project To Date calendar. Assumptions we made so far as to how to do this is:

1.) Create new budget that mirrors old budget except with new calendar that has only 1 period only. (Makes it YTD)

2.) Create a script/report to get the balances from "old" budget and load to "new" budget. Use this report to create encumbrance journals to bring "old" budget balances to zero and to initialize budget balances in "new" budget.