Big rolls of coir and sphagnum moss are not too expensive per square foot and can easily be cut into narrow strips to wrap around a center like this. Most economical if you're making multiples, though.
I've noticed that monstera gets huge with just a lot of light, water, and support, even without a pole to climb on. Monstera and philodendrons just need to be supported so the stem is always pushing up vertically, and they can get huge in just a few internodes, if they have the genetics for it. Tied or propped to a stake with aerial roots allowed to hit soil from a distance will do it.