I don't use any 3rd party software. 

If you are seeking an actual private lender or direct HML (as opposed to a third party broker) for an investment property transaction (not a consumer loan), there are numerous ways to identify them... consider starting your search here: https://aaplonline.com

But from what I’ve seen the general price level of notes for sale is way too high for the risk involved.  

What did your management contract state about screening prospective tenants and your involvement? 

Self-managing can be a great way to stay directly involved, but it’s also important to consider the demands it can place on your time, resources, and expertise.I'm certain, you have experienced some real frustrations with that PM company, but a strong property management company that can align with your overall needs, can sometimes be a priceless investment when it comes to staying compliant. 

Depending on the ARV, I think you are better of using your own cash or getting a partner involved to finish the rehab and then cash out refinance with a conventional or DSCR loan.

As a company we are considering a third party that offers virtual/face time walk thru's where human engagement occurs from the first phone call, until 11pm, weekends, holidays included- where the prospective tenant is loosely (virtually) tethered all the way through showings, feedback, follow ups and ultimately application process.

My question is since a lender is involved and I will be drafting up a contract how do I protect myself as to once I hand off the home he doesn't end up pushing me out (there is no sign of such and there is trust but this business)?

Generally yes, 30 days from the date of which the agreement ended and was acknowledged to have ended by both parties.

Too many people involved to do a relatively simple transaction.