Why not access wires at turn signal , and not at forks
Yep, that's just about the only convenient area to do it in. But note that the wires come in from the headstock area in a
downward pointing position, where they then hide / shield the (small, round multipin) connector inside a [downward] facing vinyl weather sleeve. The wires then loop upwards and through the fork covers and finally into the signal proper.
The front turn signals are 2 wires only regardless of the fact that they are multi-unit LED's, so it may be possible to work with them. I didn't do a voltage test, sorry.