I believe that s/he already has multiple .t files per suite, but wants a single TAP output from each set. Or, something to take the TAP output from each .t files, and turn it into a single TAP output.

Yes, I understood that much. But the OP wants single TAP output because "I'm building a test framework that tests a number of different components, each with it's own suite of test cases".

It doesn't seem like it's going to be substantially easier to coerce multiple TAP streams into one and then feed that to the test framework than to just make the test framework support multiple tests per suite in the first place. Probably the contrary, in fact.