I’ve definitely considered it but I have an (irrational) fear of having gaps in sponsor slots once I raise them. I feel that if I end up having gaps other potential sponsors may get scared off thinking that the price isn’t worth it because “clearly others are passing on it too”.
Chaining works on Google Home (and, I believe, Alexa?). I use it all the time, e.g., "Cancel the 5 minute timer and set a timer for 6 minutes" or your example of setting multiple timers.
Thanks for sharing this, it’s great to see people making money off of something they love.