Can I disable duplicate public key check from dropbear client?

When I use dropbear client, it causes a duplicate public key check on the openssh server. Is there any way of preventing this separate [preauth] check from happening?For my application it is very useful to have the authentication attempted just once. A StackExchange comment

When server offers an additional hostkey, dropbear ignores existing known rsa hostkey

I have a OpenSSH server configured with an rsa host key. Connection from dropbear works well, with a confirmed rsa hostkey in .ssh/known_hosts When I add a ed25519 hostkey to the server, dropbear will only connect after I add the new hostkey and no longer automatically uses the known rsa key An

Only do connection if I already know the destination?

I have an automated remote script that connects to a set of known servers. I never want be prompted to add a new host key if the server is missing from .ssh/known_hosts. If the key is missing, the client should just immediately exit. Dropbear seems to give me the option of relaxing the host