This is a complicated question full of legalities, and full of experts that hold this information as if they have some kind of national secret to guard.
If all you want is to have a spare EMM, then get a good EMM from a motor your age, same PN, same HP, etc, and install it on your engine. Use the software to manually enter the parameters for the six injectors. You should have them by now, read out from the original EMM, with the software you bought.
When you run the spare, it will work just fine. The differences will be the engine ID, engine serial number, hours run, stored codes, stored EMM temps, etc.
But it will function just fine for your purposes. Now, if you want more...like an exact copy of the EMM from one to the other....good luck on that.
From BRP's viewpoint, that would mean to them that there were two EMMs out in the world with the same serial numbers. They will not allow that. This is why they required the old one sent in by a dealer....so they could control it as much as possible. In reality, you can put a 225HP EMM on an original 200 engine, and it would now be a 225...immediately...no other mods needed. Or, on the older models, you can up a 150 to a 175 by just swapping EMMs. So, when you consider that the EMM is an integral part of the emissions system, it is illegal to tamper with the emissions system....and you see where this is going.
If you PM me with your phone number, I will be glad to talk to you about all the gotchas that you may run into. It is just too much to write here...a guy would have to write a book....