Hello Sir,
I've had the pleasure of creating various bots in Telegram to manage different channels and groups.
I've thoroughly analyzed your your request for a Bot that can provide a basic keyboard thay triggers previously inserted answers, and I'm confident I can deliver your project just as you imagined it, with some improvements to make the management easier.
For example, I can simplify the control panel you had in mind, allowing you to add/remove commands directly in chat, accessible only by approved admins.
If you have any questions or would like to check out some of my previous works, please don't hesitate to contact me.
Thanks for the consideration and have a nice day Sir.