Use a front surface mirror to create a teleprompter PC

By strategically placing a first surface mirror beneath your teleprompter mirror, you can flip everything displayed on your monitor. When the reflection is bounced off the teleprompter, it appears back in the correct orientation. This allows you to use literally any PC program with your teleprompter rig.

DIY project using first surface mirror

Alternatively to using a first surface mirror, you can also buy an external video flipping box made by Hall Research.