How to convert ed25519 private key to putty ppk?

Update 2019-03-20:
https://www.chiark.greenend.org.uk/~sgtatham/putty/releases/0.71.html supports these keys

ssh-keygen -t ed25519 -f test-key-for-stackoverflow

puttygen 0.71 importing an ed25519 key successfully

At the time of writing this, the puttygen snapshot from https://www.chiark.greenend.org.uk/~sgtatham/putty/snapshot.html seems to support these keys where 0.70 did not. It’s not explicitly mentioned in the changelog.

I tested Development snapshot 2019-01-17.53747ad

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