I am afraid that the only possible way for achieving your goal, is the one that my colleague Rossen had suggested in the mentioned forum post:
You will need to edit the control template of the pager.
I would suggest you to check this help article
, where you can find more information about RadDataPager's template structure. Generally, you can find it locally inside the Themes folder, the full path would be something like so:
C:\Program Files (x86)\Telerik\RadControls for Silverlight Q3 2013\Themes\OfficeBlack\Themes\Telerik.Windows.Controls.Navigation.xaml. Inside the xaml file you will find all the control templates.
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