AFAIK, you cannot convert campus APs to IAPs. You can, however, convert an IAP to a campus AP (just in case you want a controller in your network after you have purchased IAPs).
And to further answer that question, no, you cannot add a campus AP to an IAP virtual controller.
The issue with buying only IAPs is that you then have to convert them before you can deploy them. You cannot drop ship an IAP-105 into a campus environment and have it register with the controller automatically (since it is running IAP code).
A regular campus AP can not be converted to an IAP. There are some regulatory issues that govern this and this is not just a matter of deployment or functionality.
Once you purchase an IAP, you could convert into a campus AP and then convert it back to an IAP as desired.
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