Fanta Sea - Plastic supports to wood

I need to replace the top rails on my 16x24 Fanta Sea on ground pool and want to install a more traditional railing and balusteris similar to what CarlD has posted here, and what I believe was typical on add a deck models. The deck is supported by the plastic bracing which I believe only have a wooden 4x4 in the vertical along the water wall. These certainly do the job, but don't fit the aesthetic we'd prefer. Has anyone had any luck removing these and replacing with wood bracing?