secondary key access

I have been a customer of yours for several years, and recently I have been reading about various cyberattacks on companies involving data breaches. I was thinking that, when it comes to managing and securing my vault, it would be useful to have a secondary access key, similar to the system used by 1Password. Wouldn’t that enhance security? Would it be too complicated to implement?

Apart from a strong master password, what security measures would you recommend?

Thank you