Well, this approach appears reasonable, but I'm afraid that there is no way we can confirm that the entire process will work the way you wish.

I'm afraid we don't have the resources to test out Adagio and all the 3rd Party products that were developed for ACCPAC Plus.

After going through this conversion process, about the only thing I can suggest is to test that everything is "hanging together" by running frequent data integrity checks, and running various invoices and receipts through the converted system. Of course, since the data is compatible, you should be able to demonstrate the same process to your clients in ACCPAC Plus itself.

We'll be interested to hear the results of your experiments.