Not sure I understand your problem since you talked about making a model. Anyways.
With the recent dess library they have added lots of scanmakers from different companies. So, if your client used a straumann in io impressions and you want to use a dess ti base that's possible, you can also switch back to straumann or any generic that' s using the same platform.
Not sure if you are restricted with a us license but you could just download the eu version library, it could work.
You can also delete FDA related settings in your library. If your reseller allows you to use exo implant editor, not always the case, just delete all the white numbers like in this screenshot.
View attachment 45561
You'll also find grey numbers, those are child types/subtypes. Always go and delete where the white characters are. Then save.
If having a modified library doesn't allow you to use it you could try putting that variable in your dentalcad settings.xml. I foud it in chariside, not sure it'll work but you can give it a try.
<ImplantLibraryAllowUncertified>true</ImplantLibraryAllowUncertified>
Hope it helps.