Entering Prior Year History not just Opening Trial Balance

We are wanting to have comparative financials in the first year of converting to Sage 300.  Normally we just enter 1 big journal entry with opening balances.  

I am wondering if anyone can let me know if they have done something similar to this and if it is the correct way to do it and if it was worth the effort.  Here is what we are planning:

We convert Jan 1 2016 - our fiscal calender if Jan to Dec

- enter the 2015 Opening balances with a January date 

- Make 12 entries 1 entry per month of the net change for all accounts 

- by my calculation that should get us to the proper ending balances for 2015 

- run a year end for 2015 and now I will have the correct opening balances for 2016

- process current 2016 transactions as per normal

- Now when reporting financials I will see a comparison for 2015 and 2016