I'm sure I've said this before somewhere on prune. Pilots in Australia have an ASIO check as part of their licence application, is that not enough?
A photo licence (Proper one not the rubbish photocopy that CASA came up with a few years ago) should be all that's needed for access to airfields. The current 20 pages of photocopied useless information is rubbish.
Basic information could all fit on a standard size the same as a drivers licence, or CASA could be daring and have a smart card (Also with photo) that would include all information. Sums up CASA really, licence issue hasn't changed much since 1920's. The only thing to change much is the exponential increase in regulation. SNAFU should be a term incorporated in the CASA watermark.