I've used Car Builder Solutions toggle switches. For the heater and lights I used this one
https://www.carbuildersolutions.com/uk/knurled-ring-toggle-switch-off-on-on-3-position

Looking at the back of the switch, there are four tabs close together and two further apart. Both lights and heater use the four close together. On the lights, a green/yellow feed is split to attach to top left and middle right. A red/green goes to middle left and a blue to top right.

For the heater, a plain green is split to go to top left and middle right. A green/?purple goes to middle left and a green/yellow to top right.

I have not got hazards switch yet but i think it needs to be an on/on
https://www.carbuildersolutions.com/uk/knurled-ring-toggle-switch-on-on-changeover-double-pole

i know that the two plain green go together for the indicators to work (ignition on) and then the other four (green/pink, green/red, green/light green and green/white have to be all connected for the hazards.(ignition off)

Hope this helps!