You could create a rules and rewrite the title of the content item in the url. In this case you should use AdvancedUrlRewriter and you should crate a rule for each letter.
The second option is to change the fullContent url of the ContentView control using .ToLower(). You need to override the control and its SetItemContent where you can access fullContent ulr and set the NavigateUrl property.
navUrl = GetItemUrl(contentItem, SingleItemUrl);
i = 1; i < 6; i++)
ctrl = FindContentViewControl(
+ i, itemContainer);
((HyperLink) ctrl).NavigateUrl = navUrl.ToLower();
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