I have seen that a community of writers (Freewriters) uses an app that I can only open with VPN.
It's this: https://www.squibler.io/dangerous-writing-prompt-app
It seems to have to generate a prompt and a clock to write for 5 minutes. I've never used it. In fact I just opened it now because I set up the VPN, and it just struck me that you're working on a project like this.
I think it's great that you're doing it. Keep it up.
Cheers!