Allow credential rotation including username

[youqingz]

Hi there,
We are currently using version 6.4.1 and trying to upgrade to version 7.31.
In our production setup, we create dynamic credentials (username and password) and inject it using vault, see vault documentation.
In 6.4.1 we use the StoreOptions.Connection(Func<NpgsqlConnection> source) to construct the connection at runtime. This functionality has been removed in version 7.31, it just throws a NotSupportedException.
There is an open issue in npgsql Allow rotating usernames on NpgsqlDataSource in addition to passwords.
Is it possible to temporarily put the functionality back until this feature is supported by npgsql? Or is there another way to achieve this in version 7?