Have Airbnb set rules, policies and procedures for this crisis; and you all abide by them. 

Or know of any procedure to get this done?

I'm a fan of the tax abatement procedure so long as it's mutually beneficial to both sides of the table and that appears to be the case here!

If we keep cutting off large sectors of the economy (elective medical procedures - all food service workers, hair dressers, schools, event/promotion industries) for another 4 weeks - you will see a super cascade effect in the economy that could be where we have 30%+ unemployment. 

What I outlined above seems like your core overall goal, and core what must be overcome to get what you want.Now what you need to do is make a workable plan to get it.You don't need "The Best Plan" just a plan that seems realistically workable, because like everything else in life it will probably be a fluid procedure (vs a static plan) to get what you want.A workable plan might be to figure out how much down payment and closing cost you will need to buy property number 1, and how much equity vs bank loan you will need to hit your monthly income goals vs what you have to put down on it as a minimum.

On refinancing a title company will handle the same documents and procedure with the new lender for the second transfer.

So they have different procedures and policies that I had to adjust to.

Thank you Nick - my concern is we could sign land contract, but given he's been getting land usage for free, I anticipate he'll be the kind of person who will breach the contract, then I'll have to start "eviction procedures."

I don't think your first step should be raising the rent... you are definitely already thinking ahead to having her vacate the property, so you should simply serve her notice to vacate in accordance with your local jurisdictional laws and procedures.

Their lack of procedure and other processes should have little or no bearing on your landlording, and usually it only takes a bit of explanation to help a quality tenant understand that.