Do CD and limit your manual testing to production and focus on finding things that can be improved incrementally. If you set up monitoring properly, have users, and do AB testing or other forms of phased rollout, you'll have plenty of opportunity and feedback to catch and fix any blocking issues. Whatever you do, don't add ceremonial bureaucracy to deployments. Deployments need to be instant, a no-brainer, and totally safe to do any moment of the day (including Friday). That also makes it easy to roll out any urgent fixes, which should be rare. If that becomes a regular thing fix your automated tests.
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Do CD and limit your manual testing to production and focus on finding things that can be improved incrementally. If you set up monitoring properly, have users, and do AB testing or other forms of phased rollout, you'll have plenty of opportunity and feedback to catch and fix any blocking issues. Whatever you do, don't add ceremonial bureaucracy to deployments. Deployments need to be instant, a no-brainer, and totally safe to do any moment of the day (including Friday). That also makes it easy to roll out any urgent fixes, which should be rare. If that becomes a regular thing fix your automated tests.