This seems overly complicated. Nowadays, unstable almost never break (with the exception of files migrating from one package to another without the proper metadata) and I am updating daily. I am curious, are you using testing or unstable?
I am using primarily testing, but some packages from unstable due to security updates or where the package got autoremoved from unstable due to release-critical bugs, which happens quite often. It feels a little more comfortable using testing, knowing that I don't hit any bugs piuparts/etc blocks from entering testing. I think I initially downgraded to testing to avoid dealing with unfinished transitions, which make upgrades a bit more annoying.