Fixing period dates for large amount of transactions

I won’t get into how, but we have mistakenly had this months tax period setup as a 13th month on last years tax year (this month should be month 1) .

My current plan for correcting this is to

• Do a saved search for all transactions in that period (getting into some high numbers),
• Creating the tax period for year 21/22
• Export the search
• Change periods from current to the first period of the 21/22 year
• Re-upload on a per transaction type via csv

Does anyone have a better solution for this process?