Change Alexa Wake Word

I have a single Echo Dot at home and I’d like it to respond to “Jarvis” instead of the usual Alexa wake word. All I need right now is the actual wake-word swap; I’m not looking to set up any extra custom commands or routines. Because Amazon doesn’t expose a simple on-device setting for completely new wake words, I’ll need a proven workaround—whether that involves the Alexa Custom Assistant framework, a carefully configured skill, a firmware-level tweak, or another reliable method you’ve already used in practice. The end goal is that when I say “Jarvis,” my Echo Dot wakes up exactly as it would with “Alexa,” with no noticeable lag or false triggers. Deliverables • Step-by-step instructions (or remote implementation) that changes my Echo Dot’s wake word to “Jarvis.” • Confirmation that the new word activates the device consistently after the change. • A quick rollback plan in case I ever need to restore the factory wake word. Please tell me what tools or APIs you’ll use, roughly how long the change will take, and any limitations I should be aware of before we begin.