Hi Thierry,
Yes, that's correct instead of deleting, we can archive it and maintain the gap in an audit.
The SAP Paper which you have shared, I am working on it from last few days hope something will come out. As our project is in pending so I have time to learn and explore.
If not then I have an option of choosing 3rd party like PBS, as suggested by Nico.
Please keep posting if you find anything.
Many thanks Image may be NSFW.
Clik here to view.
Regards,
Rahul