I know you can do this, but it's kind of a ridiculous workaround. Linkshells are intended to be a form of mass communication between players outside a FC---not just two people who should otherwise be able to communicate via /tell
/tells are the only real option for "private" chat.. not that we're doing anything scandalous but there are discussions that just don't pertain to or need to be heard by the entire FC or LS.