Bitcoincash has an electrum fork called electron. Electron can import private keys. If you have a large amount you can use bitaddress.org. Every key/address pair in BTC is a valid as a BCH key/address pair. You can generate it offline with a psuedorandom generator or use a real random number generator: a penny: flip 256 times and convert the bits into a wif; Use a six sided die and roll it 99 times; roll a 20 sided die and roll 59 times.

The key and address can be stored on paper and the address can be derived from the key using softwar. Some download the web page from www.bitadress.org to a portable drive and boot to a live disk installation.