This section provides that a transfer of assets made by a debtor, whether the creditor's claim arose before or after the transfer, is fraudulent if the transfer is made with an actual intent to hinder, delay or defraud creditors."

I'd first rent out my primary residence for atleast 6 months or so of rents received seasoning before I put it on the market to sell it so I will have intent for long term "investment," for  a 1031x.

And lastly, any trickery like pretending to rent out your residence to your girlfriend would probably be considered tax fraud if you have the intent to avoid paying taxes.

My intention is to build this business helping me with your experiences but I have to beat this first in addition i have spina bifida an bad vertebral disease and I need a future in one of the poorest places in Spain.

You may have to “over pay” at first but if the intent is long term buy and hold the deal may eventually make sense with rent increases and appreciation.

You can also live in the lower unit yourself and rent out the upstairs for more or buy SFHs with the intent of adding a legal secondary unit.

However, I believe(not a lawyer), that if your intent is to never close on a home then you probably should have a license.   

However, it's always important to have multiple exist strategies - in other words, maybe you buy a house with the intent to flip it, but instead of just calculating your possible profit (remember, factor in taxes, realtor fees, closing costs, etc.), make sure the property will also cash flow after all your costs (acquisition, rehab, financing, etc.). 

If you’re going to buy properties with the intent for other people to occupy them, wouldn’t it make sense to see how often properties are sitting empty?

The intention to answer the question of crash or no crash is understandable for something that might only exist in times of no crash.