You'd basically have to run your query twice - once to get the data and then a second time to provide the aggregates. If you're set on doing this, make the first query to return data its own object. Then make another query to aggregate the first one another object.
Create a final third query object to combine the two using a UNION as you mentioned.
There is actually a simple solution to this issue. Once you have designed your crosstab query, go into design mode within the query and select "Totals" in the Records section on the Home tab. Then you can select the Sum or Count etc....
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