Merging 2 queues into 1 while also keeping the two separate queues in place??

So I have 2 queues, where records from a custom activity entity are sent depending on whether they are "local" or "partner" items.

So we went the local records to one queue, and the partner records to another queue.

However, we also want to be able to view all the local and partner records at once. So ideally, we'd have a third queue which shows all the items in the "local" and "partner" queues. 

Is this doable? 

thanks!