My diamond cut VW Touran wheels got a bit knackered after 7-8 years - tyres were not sealing well after tyre changes.
In the end I got them repainted - ignored the diamond cut and just had them fully painted. They look fine - I cannot see the difference, unless I actually look hard at them.
But if looks are important, I would go for lacquer. I cannot see why they are failing 3 times in what, 5 year warranty period? That's not normal - unless you live somewhere with harsh conditions like near the sea?