Can't set smoothing angle via script any work arounds?

Currently trying to make a game with code that bevels bricks, but have run into an issue. I'm able to get the bricks to be beveled by making a brick into a union with corners, but as any user who played roblox before bevels were removed knows, bevels on bricks are smooth. I tried setting the smoothing angle to 45 and then got the error "Unable to assign property SmoothingAngle. Script write access is restricted "

Anybody know a way I could make the union smooth in the script, or is there nothing I can do?

Also I know I could add spheres and cylinders along the edges, but I want the geometry to be faithful and it looks more accurate and pleasing if it just has flat corners rather than cylinders/spheres at the edges