Shouldn't be an issue.. Most applications have options to adjust the scale on import anyhow. And resetting x-form is general good practice before export.
It's not like a shader that transforms your object space normals with your Bone transform matrix is common practice however. Plus it's a bit heavy on performance.
I think the exercises come before the competitions in the form of practice. The contest is more like the test. Compete with others and yourselves and then get graded at the end.