Has anyone found any single-gang button stations with back-lit customizable buttons that work with Hubitat? The only ones I'm finding are either not made anymore or are for the proprietary systems like Control4 and Crestron.
Thanks.
It's technically proprietary but has an open telnet integration: Lutron RadioRA 2 keypads. (Or for a bit less money if you can give up backlighting, just the regular Picos, too.) The only official way to do this is through a dealer, and it's not cheap, but it technically meets your needs. RA 2 might be hard to find these days since it's been replaced by RA 3, which does not have an open integration, though Hubitat does currently offer experimental (reverse-engineered) support for some devices in this system, with keypads coming soon.
I think Inovelli is planning a Zigbee or (and?) Z-Wave button controller that can basically do this too and will undoubtedly cost less, but that's been years in planning and faced some setbacks (but does look cool!). But in terms of things currently on the market besides the above, I'm not sure.
They are on clearance, but LIFX makes LIFX Smart Switch 2-Button White Plastic | No Hub | LIFX . They can be updated to Matter firmware and brought into Hubitat that way. To my knowledge, non-Matter firmware does not work with the LIFX integration.
Everything is so close but not quite. The MOES says you must buy their hub and can't use Smartthings and whatnot.... Why have a Zigbee product that isn't universal? I'm really surprised no one has done something like this with Z-Wave/Zigbee. I think an RGB backlit station with engravable buttons and a few different colors/finishes would sell like crazy if it were available to the general public. Hello, Zooz??
Like I mentioned, I know Inovelli is at least planning one. Zooz does (did?) partner with a third party that engraves some of their products, plus a few others, but they aren’t backlit, so that only gets you customization (one thing I think might have been lost in some other suggestions above).
And, of course, there’s still Lutron. 
You’re right, I missed that, but isn’t that what label makers are for? 
Maybe this? Your results may vary:
https://www.aliexpress.us/item/3256812548046835.html
Well, for that project, I've had to relent and go with RA3. Hopefully, Lutron will play nice with Hubitat in the near future. In the meantime, the RA3 system will get the customer's initial needs met.
History suggests they are unlikely to, but thanks to the efforts of the people behind the Python package Home Assistant uses for its integration, Hubitat supports several LEAP devices already (rewritten as a builtin Groovy integration app and, where necessary, drivers). More, including keypads, are coming in 2.5.2, currently in beta.