I think many folks getting established simply may not have the cash.

This circumvents HR, which usually just sends me to The Work Number, one of the most useless companies since the establishment of western civilization.

As you get further away from standard real estate practice, the risk is increased by a “legal” risk that your protection may be interpreted quite differently than you expect by a court and that the subtleties of the protection a mortgage or trust deed document provide with established law and court decisions handed down for (in the U.S.) 250+ years is not existent. 

Plus, older properties in established neighborhoods often have more stable appreciation over time.On the other hand, the new development, though slightly more expensive, might offer modern amenities, energy efficiency, and potentially lower maintenance costs.

I don't have as many tips for solutions mid rehab, but I do know that most, if not all, of the very active investors that I know have established relationships with 2 or 3 lenders that specialize in programs that match their strategy and have an agent or two in the investors target market to help them find more deals without having to put much work into finding them.

A good contractor that has established themselves in Detroit and a realtor/broker that runs all over Detroit checking out properties I find on and off markets.

It is true that more experienced investors will often have better construction networks, resources, and established processes that will allow them to pay more and somehow profit more.

Wondering if establishing heirship would/could potentially work...

Even then, many won't lend unless you have a long-time and established banking relationship with them. 

Disclaimer aside, my short answer is create a land trust, transfer into it, adjust/replace insurance, redirect all accounts, and establish a bank account for the Trust.