I am guessing a replacement is unobtainiam.
Perhaps I can use a DPDT switch, square the switch tip, and dremel a slot?
You'd want a switch that is identical in terms of bat length (not shape) and angle
for the throw... then a steady hand and a dremel with an abrasive cutoff wheel.
best to put masking tape around the bat base to keep the abrasive out.
Why can't you just put in a single 3PDT??
Can you see any reason that they did not? (voltage?)
Also, take a close look at the construction - remove the switch. Some had
screws holding the bakelite tub to the switch plate... if riveted, they can be
drilled out. Then they can be replaced by #2 or #3 size screws and nuts.
So, open up the switch and see what happened inside.
Sometimes it can be repaired, sometimes new parts can be had off a donor
switch... etc.
The spliced wires, or replaced wires ought not be a deterrent. Imho.