Dovecot multiple passdb and fail2ban

[Joaquin F]

Objective: different password for remote and local imap login

Version: 2.2.36 (1f10bfa63) on CentOS 7
Users are from Active Directory, mapped to local users via sssd

After much experimentation, I have configured this way:
doveconf -n passdb userdb
    passdb {
     args = username_format=%Ln /etc/dovecot/remote
     driver = passwd-file
     skip = authenticated
     username_filter = user01 user02
   }
   passdb {
     driver = pam
     override_fields = allow_nets=127.0.0.0/8,192.168.1.0/24
     skip = authenticated
   }
   userdb {
     driver = passwd
   }

If I put the passdb's in the reverse order, I would get failure
messages (when logging in remotely) in /var/log/secure, such as:
   auth: pam_sss(dovecot:auth): authentication failure; logname= uid=0
euid=0 tty=dovecot ruser=user02 rhost=xx.xx.xx.xx user=user02
Which caused fail2ban to ban that ip

/etc/fail2ban/jail.local
   [dovecot]
   enabled = true
   port = imap,imaps

If I set "auth_verbose = yes", then I can see messages in (when
logging in locally) in /var/log/maillog
   dovecot: auth: passwd-file(user02,192.168.1.20,<Na/7f8WJC8HAqAEU>):
Password mismatch
which is probably not a big deal... but seems inefficient?

Question: is there a more elegant way to use different passdb depending on ip?

Thanks in advance.