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Welcome. My name is ***** ***** would be glad to assist.
I suggest to use the Tyco splice kits. They come in a couple configurations to suit your needs.You use standard NM cable like used in the house wiring and you can splice them in a piggyback fashion or straight through connectors
Very easy to configure to your situation. Make your own lengths as needed with stock cable.
Have seen several beds with receptacles and switches for for lighting with these units.
They are NEC compliant for in wall use.
Let me know your thoughts, that is the best option I can think of at the moment.