Is there a way to use the same Raspberry Pi (with the hassio installation) to display the front-end by connecting it to a display?
I am on the latest release and do not know if this can be accomplished.
You would need to have installed Hass.io (now called Home Assistant - Supervised) in a generic Linux install, such as Raspbian.
You will then have Hass.io (Home Assistant - Supervised) running in a docker container, and be able to use the RPi as normal and view Home Assistant using the RPi web browser.