Could you help me understand, that if you are this considerate and comprehensive about your risk factors and prepared at all sorts of possibilities, why still use a password manager solution that can "go bankrupt overnight and take my vault with them"? Why not just use KeePass and manage the vault yourself? If your answer is "I only need to do these safe box things once", then writing your own scripts to sync KeePass database between your devices is also only needed done once, right? Even if it's more hassles, considering you will never have the last 3 bullets listed, isn't that worth the trouble?