So offline signing in Electrum Forks should work. But you'll need some Forkcoin dust to avoid replay protection. Without that, chances are several of your Forks end up on the wrong chain on your Ledger, and getting them back would require getting the private key out of your Ledger. That involves risks, so just avoid it

By including some dust (a small amount) that only exists on one chain in your Forkcoin transaction, you make sure it can't be replayed on another chain.