iconchanger is a native macOS app. homebrew or DMG — pick one, under a minute either way. runs 100% on-device, no account needed.
run this in your terminal. you may be prompted for your password to install into /usr/local/bin.
homebrew; universal binary — arm64 + x86_64
confirm the binary works and matches the signature published on the release page.
move some bytes, verify them, see the manifest. your first loop.