Not that I know of. Could build walls in front of an outer layer of towers. Even then if a wall decayed or one of y’all hit something with PvP on you could die making that far to risky. Looks like we need a new option. Maybe a /upgrade friend (name) that would make towers not shoot at that friend.
A person on mystera discord suggested a /whitelist command for towers so you could type /whitelist <player name> and those towers won’t shoot them.
Edit: the player who suggested this was vatendeth from sea