What abut the dash switches from the pre 84 models?
I think the issue with the factory switches is the factory speed and delay module.
Newport uses their own switches with the speed, dwell, and squirt switch built in.
The switch itself is pretty ugly and large, but the lever looks similar to stock. Instead of sliding left-right like the stock one did it just turns clockwise. The first 90* are the dwell settings, then a positive detect for low speed and a second one for high speed. Press the button straight in for washers and a three swipe of the wipers.
Newport sells a sheet metal bracket to mount their switch but it takes away the stock look. I broke apart my stock switch and built a sheet metal support behind it to carry the weight of the switch. I’ll retrofit an illumination LED behind the clear plastic face somehow.
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ETA: I’d bet with some ingenuity and understanding of the Newport switch a column switch could be made to work.