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There is a new package (actually two) for a recent developed tool that allows mkinitcpio-tinyssh to use existing Ed25519 keys from OpenSSH.
Install either tinyssh-convert or tinyssh-convert-git and remove your existing Ed25519 tinyssh keys from /etc/tinyssh/sshkeydir (or remove the whole directory) and just rebuild your initramfs with the tinyssh hook and it will automatically convert and use your OpenSSH keys.
The wiki page has up to date information on this.
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