As
tacpot has said, the obvious and safest way is crosswind from the deadside (N), over the upwind end of 27 to join the LH circuit downwind. As well as being safe, that's also what any other aircraft in the circuit would be expecting you to do.
To join right base in a LH circuit is both unsafe and contrary to Rule 12 of RoA. It is not permitted unless there is an ATC Unit which authorises it.
JD
