I accidentally stumbled upon this recently.
Telegram user @designtea created this Telegram bot that checks availability of ENS names.
You can add the bot @ensdomainsbot
Disclosure * I do not know anything about telegram bots. I have not checked the code for vulnerabilities.*
However I did have an extended conversation with the dev about various code topics. If anyone knows how to look into Telegram bots, It would be great if you could have a look at.