Managing the software maintenance

Hi all, I need your input (way to proceed) on the way to manage the Software Maintenance.

Example: Adobe Acrobat Pro offer maintenance plan (support plan) in order to have the rights to upgrade the software and have access to the support.

I currently processed this way:
-We have a "Product Type" called "Software Maintenance"
-Software Maintenance: Type Component / Category: IT
-I call the maintenance like this: Adobe Acrobat - Maintenance
-When I close the PO (receive Item) it create Asset
-I change the expiry date to every asset (useless as the SD+ don't currently "disable" the expired asset or License)
-I change the Status (in store to in use with the asset associate to) for every maintenance Asset.

A super long process that is maybe useless, I need your input on the way to processed.

Thanks all