Hi! I'm in the same boat for Columbia, but the Writing for Film & TV track. It's my top choice but it's a lot of debt to take on. I am waiting to attend the admitted student events and hopefully talk to current students before I commit.
I've been doing a lot of research on alternate forms of funding. Unfortunately, there really aren't any outside scholarships that I've found. Columbia is, however, trying to come up with their own private system to replace the Graduate Plus loan that is being phased out in July. It'd theoretically have a competitive interest rate compared to typical private loans. More info coming soon, they said, but likely not before the commitment deadline...
It really sucks that it's not a low-income-friendly school, and I'm sorta nervous that if I go my peers might all/mostly be people from a financial lifestyle/experience I can't relate to.
I would recommend Stony Brook's film MFA if you haven't looked into it already. They have a similar curricular setup to Columbia (first year everyone learns everything, second year you specialize, third year thesis) but are way cheaper. It's also Manhattan based (not Long Island where the rest of SBU is located) and associated directly with Killer Films, a very well-regarded indie production company. Their priority deadline was the 15th, but they're still accepting apps for this fall! I'm strongly considering them myself. Unfortunately the event they invited me to falls ON Columbia decision day so I'll realistically have to decide before that.
I hope this is helpful and would love to continue to convo with you since we're in such similar situations.