Hi Rainer,
Maybe SAP could offer you a free of charge, temporary, Test license if you require a test run, if you ask nicely, I am not sure if an OSS ticket ist the way forward, in any case, you might want to contact your account representative first.
Otherwise, you can test CPS version 8, OEM version. If you want to do SAP and non-SAP, you will a test license anyway.
Regards,
HP