You can use lowes long term finance options to purchase all your materials at once at a steep discount. 2.

The alternative is cash for keys.

But the way in which I do so will be offering them to make cold calls, post ads, answer the phone calls and if they are good at converting prospects into real leads then partnerships could materialize.

The Seller would be an idiot to not allow you to do that considering the alternative.

I do not want to wait that long and I'm looking for alternatives to avoid the 6 month wait.   

Take a look at Lima One as an alternate option.

You can't split up the installation/ related costs from the materials. 

With everything going on in the world right now, I am skeptical on the likelihood of flipping the property as an alternative exit strategy.

You are both rowing in the same direction, you are both very interested, materially, in the achieving the same outcome.* They are going to do what they can to steer you (and their money) away from bad deals.* They are going to tell you what's up - candidly. 

Think E*Trade but with different paperwork so as to be able to document the individual transactions that occur off-exchange in alternative assets like real estate.