This doesn't leverage the existing Flex in your utility room or the sound of your dryer's buzzer, but a SmartDry device can send alerts to your phone or Alexa devices.
Okay, honestly, I love smart things. Lights and thermostat have been great, but there is a limit. Amazon sells a "Smart Microwave" that is on the WiFi and controllable by Alexa- but how does that solve any problems?
But- if you're interested in a smart dryer, I actually think it's really useful. Ours lets us knows when our clothes are dry- even if the dryer still has time left, potentially saving us money any time we take our laundry out early. And it notifies us when the laundry is done on our phones and Alexa since we can't hear the buzz of the laundry in the basement. But I didn't get a smart dryer: just this bad boy:
https://www.amazon.com/gp/product/B07GQBW2KS/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Anyway, I highly recommend this, it's super useful and easy to set up!
I guess you should try it and figure that out. Interesting use case.
Are you aware of the dryer device on amazon?
SmartDry Wireless Laundry Sensor and App, iOS and Android Mobile Devices. Compatible with Alexa. Smart Dry Notifications for any Clothes Dryer (Gas or Electric), Smart Home Clothes Dryer Accessory https://www.amazon.com/dp/B07GQBW2KS/ref=cm_sw_r_cp_tai_R-bqFbS1QZXTZ
I bought this for my dryer. Works well.
https://www.amazon.com/SmartDry-Wireless-Laundry-Clothes-Electric/dp/B07GQBW2KS
For the washer I have one of these; a bit more expensive than the Smart Dry. You want one with the LG ThinQ AI.
Buy this it works great. Not HK compatibility but the app is good.
New model GEN 2 SmartDry Wireless... https://www.amazon.com/dp/B07GQBW2KS?ref=ppx_pop_mob_ap_share
For your dryer you can look into this:
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Washer you can use a power monitor via smart plug but will need more complex solution to monitor it.
You can always use this contraption. https://www.amazon.com/SmartDry-Wireless-Laundry-Clothes-Electric/dp/B07GQBW2KS
Wow... very impressive. Good luck and can't wait to see updates on your progress! You should check this out also for older clothes dryers... https://www.amazon.com/SmartDry-Wireless-Laundry-Clothes-Electric/dp/B07GQBW2KS