Buy with hard money at an increased rate, refi with a traditional in 6mo to a year.

Is interest rate on financing also traditionally higher for investment property?

You also convert a traditional or regular LLC to a "Master Series".

I've done a traditional loan to my personal name and I've done a straight commercial/business loan (5year) to an LLC for a multi family but I've never pursued a fixed rate longer term note to an LLC. 

You can do anything from traditional mutual funds and stocks to buying real estate and businesses with your money.

Going through a traditional bank can be a tedious process and no guarantee that you'll even get approved for a loan.

Go for it...and get another CPA.If you have a traditional retirement account, this is a good time to consider a Roth conversion while your earned income is low...may be able to convert some or all of it (over time) tax free. 

I plan to use the BRRRR method utilizing private money and then refinancing into a traditional loan to pull the cash back out.

Every situation will differ based on the investors expectations and value of their capital.I would say somewhere in the 7-10% range would be fair for both sides.A little more expensive than traditional funding and a little less expensive than HML.

"filling out paperwork" is traditionally a job for somebody with a license.