Give it a shot at home. A ginger cordial is stupidly easy to make and you don't need to sacrifice more than a few drops of a proper sipping Scotch for the topper. IME, any cheaper mixer-Scotch is fine for the spirit base.

FWIW, if you're ever in Boulder, Colorado both "License No1" https://www.license1boulderado.com/ and "Bitter Bar" https://www.thebitterbar.com/ make excellent versions.