Making a left turn from a turn lane basically plays out one of two ways.
1. If there's a usable bike lane or shoulder one can be clear of following vehicles before clearing the intersection by slightly squaring ones turn.
2. if there's no usable bike lane or shoulder one will continue using the lane and following vehicles will have to wait for an opportunity to pass.

Filtering in scenario 1 accomplishes nothing of real value for the increased risk. Filtering in scenario 2 is just playing leapfrog.