You should wait in the left turn lane to turn left. Either that or dismount and cross the road as a pedestrian.

It's not your job to not piss off car drivers. It's your job to stay safe and be predictable. The ONLY way to be predictable is to follow the traffic law. If you make up your own stuff then drivers will have no clue what you're about to do.

Besides, when turning left, you're not taking up any more time than a car turning left would. Anyone getting pissed at you is just being a jerk; they'd be totally fine with you taking up the same amount of time if you were in a big metal box.