I have dozens of volunteer red maple trees about shoulder to head height in my yard. I have been trying to find information about training them at this size. Do bonsai methods for Japanese maples work? Can two red maples be joined together to make an arch? I need to learn more about plants

I believe Japanese maple are a popular bonsai plant. I've never seen one as an arch. I have seen Chrysanthemum bonsai made into a small arch.