nice idea, but...
If you use alexa remote 2 (cakebaked or similar) you can do it much more simple and WAF friendly.
In your Alexa app build a routine. As trigger you can set anything, you won´t need it to execute the routine. As response you can set anything by using predefined answers or make your own customized answer.
In NR use a Alexa Routine node.
Now trigger that node with anything and alexa will say what you have defined.before.
As example i show you my hunmidity alarm where alexa tells my to open the window in the childsroom if humidity is above 60%. I added a button and a gate to stop Alexa. I added a timerange too.
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