Is there any Android phone or similarly-sized device with qwerty physical keyboard including Ctrl and Alt keys? What do sysadmins use for typing on Android devices?
Since Android doesn't really have Control or Alt, you might be able to get a virtual keyboard with them but I very much doubt there's a device with them on a physical keyboard.
Your best bet is a shell with support for these keys. Terminal Emulator does Ctrl+key by holding Volume Down and pressing the key, for example.
Not a physical keyboard, but the Hacker's Keyboard soft keyboard has Control and Alt keys on the keyboard.