How to change the order in the SharePoint Foundation alternative SPSiteMapProvider

I was trying to improve the navigation for a customer without investing to much in money and time. I found a solution discribed in this blog:
Easy and Simple SharePoint 2010 Dropdown Navigation bar that works no scripts, no web.config, works on hosted providers

In summary: go to the masterpage and replace this part:

<SharePoint:AspMenu

      ID="TopNavigationMenuV4"

      Runat="server"

      EnableViewState="false"

      DataSourceID="topSiteMap"

      AccessKey="<%$Resources:wss,navigation_accesskey%>"

      UseSimpleRendering="true"

      UseSeparateCss="false"

      Orientation="Horizontal"

      StaticDisplayLevels="2"

      MaximumDynamicDisplayLevels="1"

      SkipLinkText=""

      CssClass="s4-tn"/>

    <SharePoint:DelegateControl runat="server" ControlId="TopNavigationDataSource" Id="topNavigationDelegate">

        <Template_Controls>

            <asp:SiteMapDataSource

              ShowStartingNode="False"

              SiteMapProvider="SPNavigationProvider"

              id="topSiteMap"

              runat="server"

              StartingNodeUrl="sid:1002"/>

        </Template_Controls>

    </SharePoint:DelegateControl>

with this:

<SharePoint:AspMenu

 ID="SPSiteMapProvider"

 Runat="server"

 EnableViewState="false"

 DataSourceID="SiteMapDataSource1"

 AccessKey="<%$Resources:wss,navigation_accesskey%>"

 UseSimpleRendering="true"

 UseSeparateCss="false"

 Orientation="Horizontal"

 StaticDisplayLevels="2"

 MaximumDynamicDisplayLevels="3"

 SkipLinkText=""

 CssClass="s4-tn"/>

 <asp:SiteMapDataSource runat="server" ID="SiteMapDataSource1"/>

<SharePoint:DelegateControl runat="server" ControlId="TopNavigationDataSource" Id="topNavigationDelegate">

 <Template_Controls>

 <asp:SiteMapDataSource

 ShowStartingNode="False"

 SiteMapProvider="SPSiteMapProvider"

 id="topSiteMap"

 runat="server"

 StartingNodeUrl="sid:1002"/>

 </Template_Controls>

</SharePoint:DelegateControl>

Unfortunately this Navigation provider sort the Items using ASCII order. He don't care about the order defined in the ToNavigationConfiguration interface.

So how can I sort the sites anyhow? Just add whitespaces to the title of the Web that you want to be on the first. Example:

Pages with the titles "First", "Second", "Third", "Fourth" and "Fifths" will be shown in this order:
"Fifths", "First", "Fourth", "Second", "Third"
To get them in the right order change the name to this:
"    First", "   Second", "  Third", " Fourth" and "Fifths"

And don't worry the whitespaces are trimmed in both the Navigation and the Page title.

It's not the most elegant way, but it works.

Enjoy and share