I think you are making assumptions that are limiting your progress. Why wouldn't you be able to get a loan or a refinance. You have W2 income and you have a partner that is willing to fund the down payment.
What you need is a good deal that would work as a BRRRR if you are unable to sell. I just completed my first flip with my partner and we learned a lot. I am almost 5 months in and do not have an offer on the house yet. I have a bank lined up to refinance me out of it at the 6 month mark to pay off the hard money lender and recoup my investment. It was not the plan to keep this as a rental but things went wrong on the rehab, the job took too long, and I missed the summer selling season which is putting me in a slower market. I knew my numbers up front were very conservative and a bank would refinance at 6 months at 75% LTV.
We made the mistakes that first time flippers make, but we expected to and built in the alternate exits. Be honest with your partner, go in with realistic expectations on both the deal and your capabilities and be conservative with your numbers. It might take you a while to find the deal that gives you enough room to use hard money, go 25% over budget, and take too long all while falling in under 75% LTV.
We went with a fairly light rehab, $17,000, and issues kept popping up. I would say that I do not plan to do another light rehab and will be looking for the complete gut rehabs from now on. The margins are very tight on the light rehabs and the light rehabs can quickly turn into something more extensive. On the other hand, if you go into it knowing that you are going to contract out an extensive job and account for gutting the place, then there is less to tack on as you go since you planned to replace everything. I have a contractor that is my partner and trust in his ability to budget a large job well. If you find a similar situation I would look to go big on the rehab. Just my 2 cents.