Won;t the gas pressure in the bailout end up in the dil tank, and vice versa? Won't the gas mixes do the same? EDIT just read bit about one way valves. Won't that be complicated? And expensive?
A lot of my dives I carry different bailout to dil, and I know at the end of a weekend I can be running low on dil, but then the rebreather is for rebreathing, so it doesn't worry me too much.
Personally I'd have the valve between the line on the right and the manifold, so I could open it if I had to, but would normally be closed. That way you can use it to drive the functions of the unit if you want to, but only if you want to.
Are you planning on running the unit from offboard then? Does this mean the dil will be on but the line closed? Just thinking out loud. And remembering my eggs in one basket situation, which is kind of the other way round, but I still try and avoid it if at all possible. One major failure and all that. It's not just the manifold bar but all those hoses and fittings which could fail, and if they have capacity to do you in from one failure I'd be avoiding it.
My 2c, and I now see a grandmother sucking eggs
Digs.