For the Glance, it does mention that "Custom Messaging" is possible, with exactly zero information of what that means when I dug a little more. Found another product called a TydByt that looked more app based but also may be a dead start up product. Gave up after that.
I don't know. It's a weird product space I think it's where most every day non-hobbyist uses are very niche and already addressed like stock and sports tickers by products with hardcoded closed source circuit boards. Everything else is going to be hobbyist oriented DIY which of course is VERY open source but comes at the cost of, ya know, doing it yourself.
If yall have any sort of computer inclination whatsoever though, or your kids do, building your own is not that bad honestly. Even fun for a lot of people and can be a great intro project for kids to get into electronics. If you want the easiest plug and play route I can vouch for, I've used this before.
https://www.adafruit.com/product/2277with
https://www.adafruit.com/product/5778to control it. They are out of stock now though. And you'll need a USB-C charger. Any generic one will do.
Adafruit has all sorts of guides and example code to get started and there is a plethora of LED code for this style already done floating around the interwebs and Youtube. May just need to tweak it a bit. I guess some basic understanding of Python will be needed for this part in the end.
Just an option.