Waterjet would not be realistic. Micro-laser is hypothetically possible, but would be a specialty service, probably pricey for a one-off. Condit offered a thick anti-Newton glass that was soft and drillable, making That's been unavailable for about 30 yrs now. Later AN glass is quite hard and brittle; so is coated optical glass. But coated glass doesn't do it for me; I still get rings.
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