I don't mean to be the advice bird, but maybe you can point all the points you made to your superiors and make them re-evaluate their choice. If they're a huge enterprise, then I understand
I work for a company with 3 owners and approximately 40 people. It would be okay but we need the shared 'team' aspects of a password manager -- I could be mistaken but I don't think 1password can handle a team sharing logins. I'm sure there are other options out there.
