(Assuming its allowed in your state) If you finance a permanent property (mobile homes count), then you should be able to attach that to the loan. 

typically you would want to do purchase and rehab financing,(typically up to 90% purchase 100% of rehab costs) then cash out into a permanent 30 year fixed mortgage some lenders offer products that will convert. in my experience they are not cheaper or easier. so i would shop for the purchase and rehab money. and then work on the out and get everything lined up. things to remember. seasoning on the back end and carrying costs of the project.

As I see it, you only have two options: 1) is to wait until these regulations are made permanent, or 2) go find another property.

That can help alleviate short term interest rates buying you time until they drop and you refinance permanently. 

I have a few friends that were traveling nurses and stayed here permanently. 

I still sort of "develop" farms, but just from row crop ag to permanent ag haha.

we have decent savings of around 500k and are currently living in a small city of Central California (not buying property to live because my husband’s job is not permanent and we don’t know where we will move next). 

Second homes can be rented out and used as AIRBNB, VRBO and quickly transitioned into a permanent rental. 

I dont have much experience but in my opinion, a mini storage would be someone portable/ non-permanent and you could run the business or have someone else run it for you.

Fix things right and permanently the first time and I won't have to do it again.