I agree, 10' is a little ridiculous, it'll be flappin' all over the place. But; rules is rules. As far as mounting it to the cage, a clamp-on whip mount from RMMS, then get air hose ends- both ends, from Harbor freight or HD. Put the end that usually is on your compressor hose into the whip mount, and JB Weld the whip into the end that is usually on the air tool. Quick release, easy peasy. And, I have never lost one due to coming uncoupled.
We don't use one where I ride most of the summer, but our club requires one for guides when guiding rides. Good luck!