Wow, I would be really sorry if you let your main rig go. If it is a tube thing, the Carbon is as good IMO as the BHSE, different but as good. And I can leave it on all day no worries. I jump on it anytime then. I also leave my tubed DAC on 24/7 as well, but that unlike the BHSE uses small pre-amp tubes and they are cheap to buy. I must say I ordered the BHSE twice and cancelled it for the tube reasons you mention and not being able to leave it on. My desk is my workstation for my job, as well as my system, so I can use it pretty much anytime. I have speakers are well and probably use them twice as much, maybe more. But the 009 does something I like, so I can't give it up. And not for the money it would release anyway. A planar setup would probably need a good tube amp and 3-4K phones anyway, and to get a better level, maybe, more than likely maybe not. Yeah, you can power planers of more SS amps, but the cost is about the same now to get near the level you are at.
Anyway, good luck Arnaud, I hope you don't regret it later?