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well this is debatable.

That's not the only thing debatable in the post.

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Why are you the way that you are
I did what you suggested when I was 18 and poor, mostly out of necessity, and the timing was off again within a few weeks and the keyway went from worn to destroyed.
I'll give you 0.1 poscat for the TPB references, redeemable at a later date when you've earned the other 0.9.

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It's been to long, much to long. I found a solution but Im not sure everyone will share in its joy. Like Spock said in the Wrath of Khan "What do you think of my solution?
So in sharing my dilemma with the head tech at a shop one day he said why don't you just enlarge the crank slot and get a stepped keyway or enlarge the rest of the peripherals. I couldn't shake the idea. I would lie awake at night debating it and also whether I should have a bowl of Crispex with 10% cream (so good).

My only other option was a new crank, then new rod bolts, new lots of stuff....

So I did it. Had the Supermiata damper and timing crank sprocket broached to 7mm. Bought some keyway stock and opened up the crank. It all fits like glue after some sanding etc. I even made the keyway longer.
Just finished torqueing it all up tonight.

pics to follow.

Here are the pics

Happy endings!

Make sure to note your "bespoke" damper setup for the next owner :P

I hope to keep this car in the family forever. I've sold some things in the past I regret and this one I'll try to keep off that list.