Two ways to do that include getting a bond from capital raised or securitizing the "chattel" from the loans going in and out.You'll need a steady source of accredited investors.

One tale I was told was that the owner of the loan brokerage had to fly to New York (from Oregon) to talk to the "bond market guys" or some people with "control over the money."

Some judges will require a bond be put up equal to one or two months mortgage payments, some won't even require this.

The Central Banks have destroyed the Fixed Income Bond Market, so that retired people who depended on Bonds making them interest to live on is done for maybe the next 20 years.

It's been a lengthy escrow as the seller didn't read the repair list well (speculating here) & finds himself spending more than anticipated.

Isn't the bond company now responsible for repaying the money?

I can send you my notes from the rather lengthy research into the question of asset protection.

Does anyone know a good self directed ira and 401k provider that also allows stock/bond/good investments that has Roth options and may even allow loans to be taken against it?

This is for a Fannie/Freddie type of loan since portfolio loans might not even have the "delayed financing" rule depending on the bank.I wrote a pretty lengthy article on this HERE. 

Now that May look ok, but it’s only a 3% yearly gain which is ridiculously low for such a big risk (of course if thinks go right)So it would be better to find a good deal instead or do something else with that money even bonds will give you a better result.