I managed to get the Dual Clocks onto the Sense 2.1. The only issues is the weather panel location is off. If its not snowing or raining you probably wont be able to tell. Here's the deal if your using kimi_sae_ireba_sense2.1_WeatherWallpaperMod.cab and kimi_sae_ireba_sense2.1_BGMod.cab you need to uninstall them first. Then install the attached .cab and then reinstall kimi_sae_ireba_sense2.1_WeatherWallpaperMod.cab. Hope fully you will end up with this:
Do not reinstall kimi_sae_ireba_sense2.1_BGMod.cab as the clock cab already has the BG4all. Hope it works for ya.