Hello, thanks to all of you Francois, Daniel and Michael for uploading my changes to experimental.
Whilst I already tested the patches individually earlier, this gave me the opportunity to test them in cooperation. In particular, the versioned Conflicts issued by systemd-sysv now work as expected. In performed a number of manual tests upgrading from bookworm to experimental and replacing diverters for one another (molly-guard/bfh-container/progress-linux-container) as well as replacing divertees (systemd-sysv/sysvinit-core) and removing packages. When doing this with apt, this all looks good despite systemd-sysv not having added my patch for #1057220. This is expected as that patch mitigates problems resulting from direct usage of dpkg. I also checked the dumat report for these uploads and am generally happy. Given that the current mitigation does make diverters not issue Breaks, molly-guard continues to work with the current sysvinit-core that has not moved its files yet. My patch for progress-linux-container and bfh-container fails to remove /usr/lib/container on package removal. This probably breaks piuparts. I am attaching a followup patch. This defect is unrelated to the /usr-move as far as I can tell. I would prefer systemd-sysv to also address #1057220, but Michael confirmed that he was not intentionally excluding it. Also the systemd-ukify split leaves an unusual file loss scenario while upgrading from bookworm-backports and simultaneously installing systemd-ukify (P1), which Michael will likely mitigate by upgrading Breaks to Conflicts (M7). I also thank Marc for his works-for-me feedback regarding molly-guard. Given all of this, I am happy with all of these changes moving to unstable and trixie. Thanks for your patience. Helmut