Our go-to mortgage broker does not have a lender in our network that will consider an off-the-grid property for financing.  

You may want to consider an umbrella as well if you have significant assets to protect

If not, call them out on it & consider an "employment adjustment."

Again, a lot of the options mentioned above are great tools to use but definitely consider an option that presents a one-stop-shop for collecting rent as well (and has faster payment processing than the others).

Or test a much shorter pitch, "hey, would you consider an offer to buy your property at 123 main st?".

Also, in CA it is $800 a year for each LLC so I would consider an umbrella liability insurance policy instead especially with if you net worth isn't that high.

First, you might want to consider an informal appeal.

I also have what I consider an excellent resource in this space as well.

I am looking for a rule-of-thumb or general advice, not specific to my situation because there are so many other variables to consider -  Given the high interest rates today, is it more favorable to consider an adjustable rate mortgage with a lower interest rate for the first 5 years and then refinance in the future with a hopefully reduced rate, or stick with a 30 year fixed rate mortgage?

Make a list/policy of what you consider an emergency and non-emergency.