I know there are ways to finance these types of investments though hard money loans, private money, subject to and even more.

You could approach the situation with private money or hard money lenders and have them back your financial needs.

I have posted the video tour in my private YouTube channel where you can provide the address or QR code to make it easy for the more tech savvy investors to view.

On conventional loans, private mortgage insurance (PMI) is required with less than a 20% down payment.

So do you think that i could finance my long term strategy (buy cash and hold) with a short term strategy (buy and sell) with private lender o equity partner...?

It is called Trust Deed / Private Mortgage Investing.

Retail with money partners - get JV credit partners, private lenders, hard money lenders, etc, and sell to retail FHA buyer3.

"Private Lenders"Anyone have any other resources, or experiences they can share about portfolio lenders.

The hardest let about getting the funding is not being able to match any of the private lending or having the funds to put down a down payment on  a cheap mortgage. 

If you do not have the required "Gap Funds" to satisfy the HMLs requirement - this is where you will need to "pitch" your property to other private lenders or "Gap Funders" on this site, or by networking with other investors outside of BiggerPockets.