The only possible solution that I can see, would be to configure a separate partition and assign it to your existing DNs for 100 and 101.
Create a Broadcast line-group and add both 100 and 101 which are in the new partition.
Create a Huntlist and add the line-group created in the previous step.
Lastly create a huntpilot with the pattern 100 and assign the original partition which was assigned to your 7911 line before you changed it. The reason for this is so that you don't have to change the CSS of your other phones. Select the hunt-list created in the previous step.
Repeat the above step to create a huntpilot for DN101.
Once this is complete, when a calling party dials DN100 or 101 it will match the huntpilot instead and therefore ring both members of the broadcast line-group as they are in a different partition.
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