I don't know about the Harmony One, but I have the 890 (it was 220$, one-day special at my local Future Shop) which is RF-based and comes with 4 dual-repeater for IR devices. With that, you would just have to stick one somewhere pointing towards the projector.
I quite like mine. It took me forever to program to my liking (14-20 hours!) even for cross-purpose activities such as watching Hockey and listening to music at the same time and all the minor adjustments I like to do to be easily accessible through the 8 visual buttons (on the LCD screens).
