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Wouldn't it be possible to use a diamond tipped scratch pen to scratch the glass length wise and then snap it like you would do with floortiles?

How sure are we that the glass is actually tempered...

If I had a 15 mm thick hone, I'd
- cut it in half through from side to side, and end up with 2 7 mm thick hones.
- Mount them on a backing using epoxy.
- Lap both
- sell one

If all else fails, you can always chamfer the edges to the extreme so that you end up with a 1" wide honing surface on a 3" wide glass plate. :)

How much would the cheapest usable hone cost? Say 1000 grit?

If we all chip in 5 or 10$, we buy a hone for the experiment, and if it succeeds, the 2 hones are raffled among the participants.