As I was discussing it with him, I eventually thought about the mechanics of it and I'm not sure if that would be an option? 

I just get the umbrella policy from my primary insurance company (i.e. auto, personal home, rentals, etc.). 

No draws = no interest  I agree with Sergey that a HEOC would likely be the best mechanism to create the fund without paying interest on it until you deploy the capital.

I would Bet that there are people who overpaid for real estate, autos, and other equipment in the last year that they rent out for cashflow.

The mechanics of this would be done by a Closing Agent as part of closing in escrow.Anyway, I don't know much about reverse mortgages, but your best bet is to have the heirs find out the exact terms of this particular reverse mortgage. 

And the mechanism is a buyout. 

Right now I just want to direct link to my listing on Airbnb, but some features that would be helpful:1. connecting a calendar and showing availability, then when someone clicks on it, they're directed to my airbnb listing2. auto-importing all my airbnb photos/description over to the website without me doing much work3.

But, ultimately, there should be a mechanism or plan to distribute capital from the business to owners. 

If you are not in contact with the seller ask the wholesaler, but owner financing is just a financing mechanism no different than getting lending from a bank

the policy provides additional Liability coverage if the underlying Auto, Home, or rented dwelling/condo has their limits exhausted in a claim.