As I understand it, nopez don't want to cancel any subscription before it ends, he is looking for a solution to keep Skylink while following the rule to disconnect from server after subscription (Sky DE) ends:
using CCcam-protocol (as defined in your signature) with standard configuration of CCcam the server provide packages you can use (provide list of CAIDs available). Once your SkyDE subscription has ended you need to look in the billing > My subscription > Settings for CCcam protocol if the port has changed, or if you have 2 port numbers now, one of them will be removed. If you see another port number (or one is missing) you need to reconfigure your CCcam reader/line on your receiver.
I am not sure how server handle that on CCcam protocol, but I believe you will see another port number once the SkyDE subscription has ended, or if you see 2 port numbers at the moment one will be removed at the end of SkyDE subscription and you need to update the CCcam connection line on your receiver.