You can't possibly use all standard units... would it really be impossible to overwrite soundsets like Wendigo, Spider, Rock Golem, Bristleback, Draenei, Furion, Drek Thar, ...
There are many campaign units which have other sound sets as well.
I mean, it is possible to create a new soundset with triggers... it would just be more work than simply rewriting default soundsets.
And I can't see how rewriting them could be a problem, seeing there are so many of them.
I can create a library to setup your own custom sound sets, but it will be vJass.