Are there no members from your tribe online who can help destroying the door for you right now? You can explain to your tribe member later why you destroy his/her doors later by placing a sign with your messages newar his/her doors.
The other way I could think of is to leave your tribe (if you’re not the leader) so the towers could hit you and ask your tribe’s leader to invite you back when you’re out, provided he/she is online right now.