Oh wow.
This will be a challenge, too. The harness you have isn't wired for the four pole ignition switch on the headlight, it doesn't have indicators, and your switches are a different configuration.
What kind of indicators were you planning to use?
I think the closest one made is this German one. But it's a battery model.
https://www.scooter-center.com/en/wiring-loom-bgm-original-vespa-rally180-german-versions-with-battery-indicator-and-ignition-lock-sc5004?number=SC5004
It has the indicators on the headset, and the ignition switch.
The handle bar switches are different, though. It has the add-on turn signal on the left side, and yours has the two square switches.