My goal is to at least have positive cash flow while I build equity in the investment property.Has anyone successfully purchased a buy & hold with this strategy?

I wouldn't be selling in this market personally, so if you don't sell the SFR and you really want to do this, a DSCR cash out refinance on the triplex, or a hard money 2nd is your only option to get the liquidity needed to make this move.

And then while it’s in the process you provide your QI will all the cash needed to finance the property.

Probably their contract says they could do the same to you, just returning your earnest money as liquidated damages.Now if you were a cash buyer, that all might have different consequences.My 3rd thought is discuss this with your new employer. 

Our goal is to find and invest in cash-flowing properties.

Purchase price: $770,000 Cash invested: $300,000 First house hacked for 2 years then moved out and converted to mid-term rental.

Cash flowing $1250/mth Lessons learned?

Purchase price: $50,000 Cash invested: $30,000 First BRRR property.

My profile is a 700-credit score, $200k W-2 salary and $5,500 in monthly rental income and limited cash. 

Although i have positive equity and the value of the house went up I’m breaking even with no cash flow.