Hi Marc
Would be curious to know if this work, have you tried ?
According to note 1680045 it could make it, but I'm not sure that the SPS12_stack.xml is made for that kind of usage.
Best regards
1680045 - Release Note for Software Provisioning Manager 1.0 SP07
You want to install an SAP ABAP system including a higher support package and/or including further ABAP Add-Ons.
You plan the installation target using the landscape planner at https://service.sap.com/sap/support/lp/ui , and apply the generated stack XML file to software provisioning manager (minimum: 1.0 SP06). Included constraints and defaults from the planning will be used for the initial installation and usage of the succeeding Software Update Manager with the same stack XML file will be prepared for a unified consumption experience.