If you duplicate your SD Card there is no risk breaking anything 
nothing hurry, I can wait until you finish all your works and have time to test it.
I tested your flow 3 weeks ago & it was working fine.
what I didn’t like, that you use Alexa temperature (deg) to set the timer (sec).
mean while I will try to complete it by myself .
I usually try the easiest way as you are an expert in Java Script.
Thanks.