The current switch is mounted in the dash. I had the dash cover off and checked it over. It's a turn signal switch that someone had retrofitted. It looked original until I removed the dash cover and saw the mounting wasn't right.Asphalt pavers have on/off/on switches on the screed extensions, but they're momentary. They're also about $70 from Cat but they're weatherproof.
That's just the first thing I thought of. The M series Cat loaders have a forward/reverse rocker switch in the console but that would be megabucks I'm sure