Per user edit permission to specific unpublished page

[torf]

My task is to give users edit permission to their specific page (not created by them) as long as the page is unpublished and somehow I can't get it to work. The idea would be

• user can only access a special branch in the backend (I do not want them to see all the pages)
• in this branch there are dozens of pages (same template) but each user can only access his personal page
• as long as the page is unpublished they can edit and save it
• the publishing permission is with another role
• as soon as the page is published the user may see it in the backend, but has no more editing permission

So the idea was to use Admin Restrict Branch and Page Edit Per User modules which both work great. But Page Edit Per User seems to fiddle with the permissions, so the user can still edit his published page even if he has no page-publish permission. Is there any way I can revoke the page edit permission manually after the page is published (and reinstall it when the page is unpublished again)?