Having some natural gas purely as a secondary emergency heat source is well worth it IMO.

It might not be needed though if you have a battery generator and enough solar panels.

But if you have a BBQ with propane and the sun didn't shine for many many days that should be sufficient.

Your comment is ambiguous; in the event that anybody is interpreting this as "use your propane BBQ to heat your house" don't do that. You are highly likely to get a first-hand experience of CO toxicity.

having a military grade generator (can pick up decomissioned ones for pretty cheap) as a backup still works.

I was thinking just high heat output gas logs. Heat source, you can cook on them and it's not loud.