I'm trying to set up a personal accountant with access to some of my financial accounts. I would like to use LastPass sharing to give them access to the accounts without giving them access to a password that could be used by third parties. However, according to what appears to be a LP staff comment, the recipient of the shared password could just inspect the element in his browser and discover the original password. Can this possibly be the way it actually works??? If so, what's the point?
You can't. End of discussion.
For them to log in, they have to know the password. If this is not acceptable to you, you will have to work out a solution with your provider where two separate accounts can get access to the same data. In my country, this is a rather common feature for banks.
Note that sharing your password will probably be in breach of any contract you have with the banks, which may severely limit their liability.