We've just patched the docs to explain a way to opt out that ought to work fine for you. It might take a while to build so here is a link to the fix: https://github.com/elastic/elasticsearch/pull/21220/files
Essentially, set http.host to the non-local IP while keeping network.host at its default. You can't form a cluster but you can test against a single node. If you want a cluster you'll need to make the bootstrap checks happy.