Please verify the version you are running. Your comments indicate you are still running on pre-6.7.
* Licensing in 6.7 have nothing to do with the number of Clearpass servers you are running as Access licenses are separated from the Platform license.
* Post-6.7 you would still see alot less license usage even with no Accounting since in Pre-6.7 you would have a weekly accumulated license usage for 802.1x..
If this is the case - I urge you to upgrade which will help alot with your license issue - and with Radius Accounting you will see even less of a strain on your licenses :)
* During convertion you will be left with your 1000 Access licenses
* You might also get the 2x25 Guest (=Access), 2x25 OnGuard and 2x25 OnBoard server licenses