@Lance NeighborsA trust would be the simplest way forward.

The simplest is "John Q.

Or in simplest terms: sh#t-burger or turd-sandwich, which are we eating, lol.... 

At its simplest form, I have turned a small loan into a bigger loan, and I use the extra to do what I choose.

Commercial leases can be a pain as a lot of them are different, but in my opinion Ground leases should in theory be the simplest.  

From reading some bigger pockets books, I've gathered that house hacking is one of the simplest ways to start.

The simplest way is a promissory note laying out the terms of the loan (term, interest, payment frequency, etc.) but this leaves you with no recourse to take ownership of the property if the loan is not repaid. 

That’s the simplest one can get.

What the simplest and best pro forma spreadsheet out there?

That's the simplest way.