Sounds like a situation for a wrap or "All Inclusive Trust Deed".

That, to me, is inadequate.

The other thing is it is always a gray area when you start asking lenders about how this will be viewed in the future as they can only really talk about now but I would think that if you have the 1 month claimed as copies of all checks and corresponding deposits that match up with your lease and can really show detail they would allow you to count the 75% to offset some or all of the mortgage payment.

You'll have a tenant in there most or all of the year.

Does anyone have recommended smart phone aps, lists, spreadsheets, website links, etc that they feel give them a competitive advantage at any or all stages of the flipping process?

In your situation, I think the most important question to ask is do you want the security of knowing your house is paid off or do you want to tap into some or all of that equity to start/grow your business. 

Or all of the above? 

I just checked irs.gov you can roll part or all of your 401k to any traditional ira then set up your solo 401k and take a distribution as long as you put money in solo 401k with-in 60 days no tax issues.

One or all of the aforementioned could surely free up that heaviness in your heart that you're suffering from.  

I'd suggest you get on Facebook, Twitter, Linked-In or all of them and get cooking.