I don't have any personal experience, but that sounds like a plan to me. I do really like propane, and I recently got a small generator that runs either gas or propane. Just need to change out the spark plug so it burns hotter or something (for propane). In fact, some people just use propane in their generators because it runs cleaner.

Idk, frankly I think all fuel is a non-issue, because in an emergency all these things run on money, money, lots of money. Fuel today, gone tomorrow. 20# propane tank? Gone. 8-gal gas? Gone. Hopefully it's enough to run your appliances & get you by until utilities are restored.

In an extended power outage or grid down type situation, generators are great to have but you'll be limited by your ability to obtain fuel. And the money to run it. A generator will be loud & could attract unwanted attention from beggars, looters/thieves. The best investments you can make right now is increasing your efficiency ((insulation)), reducing your energy needs, & investing in things that can help you in a grid-down situation.