Sorry, but the DIC and the radio use the same core tech: VFD (Vacuum Fluorescent Display). They naturally show as light green and the filters can change the color. However, they do not emit a full, broad, spectrum of light and have little in the red area of the spectrum. As 2kwk says, you could get more of a deep orange with a strong red filter, but you'll never get red - plus you'll cut down the brightness of the display too.
This was my DIC through a red filter. This is as close to red as you'll get:
It was too dim for me, so I managed to go back to the grey-white similar to OEM on a Solstice, by using a piece of a Roscolux gel filter #34 (flesh pink).