Mikel
I do not have pauls bmcl but I do have a different version (no I'm not poaching Paul

) i originally went to John with the idea of the remote inflater buttons as I cannot reach the ADV /T piece positions so could not use Paul's O2 add idea . I had 2 made by John for exactly the reason of ease & familiarity .
I have routed mine along the waist band webbing so there is even less ots but you could route it ots if you wanted .You can then easily unplug your on board to plug in offboard the same as with ots lungs .Follow the link below to view John's manual add :-
PRODUCT
HTH
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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards