DMAAI setup changes related to PO Receipts

We had discovered that for our NonStock items (with IVI=N) at time of PO Receipt we were hitting an Inventory related account for the Tax (and not the account related to the Item - from DMAAI 4315). Further testing determined we needed to add our GL Class entries used for our NonStock items to the 4350 DMAAI so that it would hit the same account/setup as in 4315 DMAAI.

So my question is, before we make the DMAAI 4350 updates in Production, are there any thing we need to consider when making these changes

For example 1) Is there impact to PO Receipt Reversals on receipts that occurred before the change - does the reversal use the current DMAAIs or does it reverse using the gl accounts from the original receipt? 2) Any JE necessary to adjust for those open receipts that booked to the prior account used? 3) Should the DMAAI update occur at a specific time such as at 1st of the month?