Perhaps such a setup could come with a system to inject a small amount of additives from a replaceable canister to give the flame color, and to give the gas an

Perhaps such a setup could come with a system to inject a small amount of additives from a replaceable canister to give the flame color, and to give the gas an odor in case of leaks like they do with natural gas. I'm not chemist so I don't know if that's a possibility with hydrogen.