Yes, It could be possible. One possible way would be - you could create a custom java application to fetch the date from MDM_STAGING table from any database outside MDM using jdbc connection. Deploy the application in any application server. You can add separate tab to display the data using external application URL.
<topLevelTab name="custom_bing_tab" displayName="Bing Search">
<externalLink name="bing_username" type="IFRAME" url="http://www.externalapplicationurl"
Please check the link: Custom Top-Level Tabs for custom Tab in IDD
Or you could check this Support KB as well.
Sure I will give it a try. Thanks for suggesting!