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I have a set of cranks (no chainring) that would fit the bill. FCM540 175 Hollowtech 1 (Octalink, not external BB). BB is included (126mm BB-ES25). Reasonably worn but the BB seems ok and they work fine.
I can't fit them as my BB tool won't go over the Octalink spindle.
You can have them for free if you want them. Collection from Wandsworth. Possibly post at cost.
I imagine there will be better offers though.
Unfortunately not. According to this the max they made was only 12mm longer (and most likely hens teeth). Will that be enough?