Damn, 2 weeks till I head to Mexico. I have enough trouble getting my rebreather through TSA scrutiny. Don't imagine this will help.
Why on earth would you have any difficulty checking in a rebreather, whether in checked baggage or carry-on?
While I love drama, there is no reason for it here, we travel with ours both domestically and internationaly on a very regular basis and have no difficulties with the machine, the bottles that go along with it, or the absorbent.
Would love to hear what your particular issue was.