Unique Seller finance opportunity. I need advice from more experienced investors.

[Casey Ferry]

Hello thank you for taking the time to read this post. Ill give a little breakdown of the situation. I am currently moving and my wife and I have agreed to house hack our next property. In addition to this we want a property with at least 2 acres to have our home on one and have a glamping structure on the other. We have looked into the local county codes and are located next to a popular state and national park with good numbers for reliable returns. In our research we found the perfect property but here is the dilemma. It is listed at 550k but WILL NOT qualify for bank financing. So it has to be cash or creative finance. I contacted the agent and she said sellers would be willing to hold a short term seller finance in exchange for $200,000 down payment and then a refinance into a bank loan. The property needs about 50k in rehab. The property has been on the market over 100 days and I think both the purchase price and the down payment could be negotiated down.  We have about 70k total capital to deploy. How can I purchase this home to house hack (and double dip with the glamping) and come up with the extra money for down payment/rehab? Another reason I am more inclined to pursue this home is location as well as every other home in the area with any land is over the 700k budget so this is a unique opportunity to add value, house hack and glamp.

Am I being realistic? What are the options I could pursue. Thank you all so much!