Had another go at the Katana today, between watching three episodes of Motorsport Obsession, Project Binky.
Cleaned out the master cylinder & washed the seals in hot soapy water & soaked the piston & retainer in alloy brightener acid.
On close inspection I'm quite confident it will work again with the existing parts.
The failure was caused by a few lumps of alloy corrosion affecting the sealing surfaces, the o ring hasn't suffered.
I also discovered today that the smell of stale fuel makes my ears hurt.
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