Don't you need to give Termux too many permissions (for obvious reasons and well justified sincd it's a terminal emulator)? That's the only thing keeping me away from Termux, I'm not very familiar with it and I don't feel comfortable going ahead onto an app like that since I'd use it exclusively for this purpose. Thanks for the suggestion though (I didn't know you could run vim/nano from there, interesting, by the way). For anyone reading this and don't think this way I do and want to give it a try, here are some Termux official webpages:

• Project's main webpage
• F-Droid app page
• GitHub Repository