These are all you need to to get those rail bands on. No need to over think it and over engineer it.
A good steam iron, water spray bottle , damp cloth, good quality Polyurethane glue and good quality masking tape.
This is 5mm thick Paulownia that is very dry, so I needed to moisten it up, stream it and it bends so much easier. You will be amazed at how much pressure you can pull with good quality masking tape.
Cheap, light weight and no restictions with angles and clamps.
Keep it simple , keep it cost effective and don't do you head in trying to over complicate things.