It's always important to be clear and simple... ...a mate of mine was t-boned by a police car that was driving with full lights and siren... ...he was turning left out of a side street onto Springvale road... ...the police car did a u-turn and got him in the drivers door... ...he argued that even though the police car was under L&S, an indicator stating the intention to do a u-turn looks a lot like an indicator stating the intention to do a right turn...
Because he didn't try to bamboozle the judge like the cop did, he got all his fees and out of pocket paid by VicPol...
But in the OPs case, it's going to be really hard, just for the simple fact you are meant to give way to all oncoming traffic when turning right...
If there was a traffic island, be it built up or painted, then you might have a better argument...