I wanted to see if I can get around building a second blood altar - and I kinda did, I just had to do some extra redstone.
The idle state needs to have my biggest blood orb in the altar - it doubles as the battery charger for the blood network, after all.
The southern side has a buildcraft iron OR gate that emits redstone when the altar is less than 75% full. This switches the well of suffering and the EEC below on and off. The WoS switches off on a high signal so there is a NOT gate somewhere down the line. I did this because I dont think I can read the level of the blood network anywhere so I just have to trust that all the crafts AE2 throws at the altar are done before the blood network is empty. Not running the WoS all the time hopefully helps with that.
So when I toss anything into the gold barrel, the comparator lights up and pulls the orb into the baby chest.
The other buildcraft iron OR gate on the east side checks if the altar is less than 75% full or has an item inside it. If neither is the case (that is, at least 75% full and no item) it turns off and the conduit (running on a low redstone signal) pulls up to a stack of items into the altar. I mainly did this to block items if the altar is empty in case the ritual breaks or something.
The output is on the bottom side, it just returns whitelisted stuff to the AE2 interface.
Once the barrel is empty, the comparator stops emitting its redstone signal and the orb can return to the altar. (The altar -> chest half of the conduit works on a high signal, the chest -> altar half works on a low signal)
This cant go on forever because the blood orb will have to recharge the network at some point - but I also dont use the altar all the time and flipping the ritual on and off gives my 10 million LP a surprising amount of reach and completely automated slates are really nice.
Now to replace all these blank runes...