Build custom ac-dc power supply- ground wire
The best option in my opinion is:

1) Connect the chassis pin to the power supply cabinet.

2) Provide a chassis jack in the front panel of the PS.

In this way, depending on the use, you can decide to short the (-) output, or even the (+) output to the chassis as needed for each application.

Professional power supplies provide a metallic bridge to connect (+) or (-) to chassis (and chassis as a third jack).