Here’s some conceptual graphics based on the quad you’re considering. My idea is to use fiberglass tent poles. They’re cheap, strong, flexible, and readily available at WalMart and sporting goods stores should one break and you need to replace it. Might need to make custom connectors at the T-joints but I imagine you could even find those at the sporting goods stores or eBay.

The attachment points to the frame get a little tricky. In the back on the integrated rack, not so much. But up front it becomes a little tight for space to find a decent anchor point that doesn’t interfere with your legs or steering. The 3D models are my concept for a custom made receiver tube for the end of the fiberglass tent pole. It attaches at the axle bolts of the sidearms/struts/what-have-you of the front wheels.

Then it’s just a matter of attaching your canopy of choice to roll-up/roll-down.