The relays would make the heavy-duty parts off the shelf parts, and then the complicated part, the rotary switch, could be low voltage and light duty. Instead of a rotary it could use an electronic dealie called a shift register, either hardware or microprocessor
40 yrs ago I worked briefly for a sign-maker. He said there are industrial light bulbs used in signs that last much longer than household ones, so they don't have to change bulbs constantly. I think one of the great unheralded achievements of the 21st century is you don't have to buy light bulbs anymore. Short life of light bulbs was contrived by consortium of manufacturers, something well-documented. Probably could not continue in this information age. Maybe they realized the jig was up.