The 220 volt neon will be ok but depending on the fan it may be difficult to see it flash, with an average fan the spike is unlikely to burn the transistor, with these fans it is really good to see the flash so a first timer knows when they see it, the fan is working as desired.
I actually used a 220 volt neon from an electric kettle for my fan and it did make it flash so I would say go for it.
They are easy to break aren't they I broke a few. And messed up the wiring a couple of times.
Cheers
Another problem is that the coil wires are all 1 ohm each, and it will only start up with the pot at 0 ohms or very slightly above, any higher and it dies. But due to the 0 ohm/1 ohm resistance it draws 3 amps (max I let it get to), and I had to turn it off within seconds because I could smell the wires/motor producing the smell of burning electronic components. So this one will need more work I think 
, i have two 12V batteries, unless i use the solar panel.
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