How about adding a panel with a datasource pointing to the settings document. You can then add a readonly field bound to the RT field of the settings document.

 

Something like this:

 

    <xp:panel readonly="true">
        <xp:this.data>
            <xp:dominoDocument var="docSettings" action="openDocument" ignoreRequestParams="false">
                <xp:this.documentId><![CDATA[#{javascript:"unid_of_your_settings_document"}]]></xp:this.documentId>
            </xp:dominoDocument>
        </xp:this.data>
        
        <xp:inputRichText id="inputRichText1" value="#{docSettings.your_rt_field}"></xp:inputRichText>
    </xp:panel>