These orchids are Vandas and their air roots are how they grow. I would not cut a viable root. It is how the plants takes up its nutrients and cutting off roots could severely impact the health of your plant.
You could try to loop the roots gently. Sometimes, roots are more pliable when they have been soaked in water for 20 mins or so. That could help you shorten the root structure without cutting off any roots.
I only wish i could root Vandas with such a healthy root structure - You are to be envied!
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