#!/usr/bin/env bash
keyid=YOUR_KEY_ID_GOES_HERE
gpgconf --kill gpg-agent
cd "$(gpgconf --list-dirs homedir)/private-keys-v1.d"
gpg -K --with-keygrip --with-colons "$keyid" | \
awk -F: '/^grp/ { print $10".key"; }' | \
xargs rm -vf

gpg-connect-agent "scd serialno" "learn --force" /bye