Would this work? Several like this on Amazon. Sirui, Sunwayphoto
What works is my Sony F5, with Miller head, and Sachtler Tripod.
Yes, the iPhone 11 Pro Max is great for reasonable-level media work and easy to cart around, but the Sony FS5 is, well, worth the heavy carrying for any important job. I am not saying that the iPhone 11 Pro Max is going on the shelf, but rather that these old bones would rather carry the FS5 for many things.