alternativist
/ɔːlˈtəːnətɪvɪst/ /ɒlˈtəːnətɪvɪst/noun
1In the First World War (1914–18) and the Second World War (1939–45): a conscientious objector willing to carry out compulsory service as a non-combatant. Compare absolutist. Now historical.
2A person who practises or pursues an alternative approach or lifestyle.
Origin
Early 20th century. Partly from alternative + -ist, and partly from alternative + -ist.