Another way would be to get a universal remote that can sent RF signals to an IR transmitter - like the
Pronto Pro,
Marantz RC5200 or the
RC9200 (the RF extender is included with the RC9200 - Pronto Pro and RC5200 owners have to buy one separately). Fix one of the RF extender's LEDs over the sensor for one Digibox (and put masking tape on top). On the remote, you can create 2 panels for your Sky boxes and assign one of them to the RF extender (the remote's own IR will be used for the other).
This costs a lot more, but can be extended to cover more Digiboxes (using more RF extenders), can control all your other devices (which means you can have a macro that switches on your TV, amplifier, digibox, etc and makes all the necessary audio and video input adjustments)
and (drumroll...) removes the need to point your remote in different directions!