connecting panel mount switches to PCB
Unfortunately, if you have already chosen switches with solder lugs, you have little alternative but to hand-solder them to wires.

One alternatives is switches with PCB pins, which go directly into a board. This can make alignment with the panel difficult, so the technique there is to fit the switches, then push the PCB on, then solder the PCB. It does require that the panel be designed with a board in mind, so all switches on the same plane, not too far from each other, nothing big between them to foul the PCB, though board cut-outs can solve this.

Another alternative is switches with blade connectors. You can buy ready-crimped wires with connectors that push-fit onto the switches. You could mount blade connectors to the PCB as well, and push on wires with a connector each end.

Another alternative is switches with 0.1" pin grids for terminals. These would connect with IDC connectors and flat cable, though there are quite low voltage and current limits for this type of connector.

As Hearth pints out, you can also get switches with screw terminals.