I could make a batch file something like:
xcopy "C:\Users\%username%\AppData\Roaming\Adobe\Acrobat\10.0\Security\*.ac rodata" "C:\Users\%username%\AppData\Roaming\Adobe\Acrobat\11.0\Security\"
move "C:\Users\%username%\AppData\Roaming\Adobe\Acrobat\10.0\Security\*.ac rodata" C:\Backup
(Translation: xcopy command would copy all .acrodata files to the version 11 folder where .acrodata files live. The move command would them get them out of the version 10 folder which should prevent version 11 from seeing them there on startup.)
And add the batch file to the Launch Other Applications part of the Customization Wizard.
Think it would just silently accept the copied files? I can test tomorrow.