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This is the cheapest - I think.
I have one of their lower tier lights (30 lux) and that is really nice.
It looks like a dog's dinner though. -
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What @Heldring said!
Slave 650b.. -
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It even comes standard with Sora

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Pelago Aristo would do the trick, I think.

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Mandatory Ultraromance comment.
He presumably rode the Baja Devide with 12 speed friction.
So I guess it will work - the only question is how well.

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Here you go
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Depends on what you consider cheap..
Fairdale do this

And I found it for a little less than 20 pounds at a Danish distributor. -
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I had a similar experience with regular v's. It seems they just eat up soft rubber brake pads. But I'd rather change brake pads than having them chew through my rims.
---edit---
Also, after fitting new pads on mine, I flipped the spacers around so the thickets spacer is inwards - It is supposed to make up for slimmer rims.

I agree. The paint looks ace!
Did you go for the spray on or brush on?