This type of situation is always hard. You are going to have to look into your heart and make a decision that none of the rest of us are going to have to live with.
As you are soliciting opinions, I will offer up my thoughts. As the owner of dogs that fought, I chose to split my house up into individual sections that only the dogs that lived there got, ie, one set of dogs got the front of the house and another got the back. There were TWO doors between the sets. When dogs were being exercised EVERYONE knew who was out and where all the other dogs were. When we had company the dogs split time with the company. When we had stay over company dogs slept in crates and were out in turns. Sounds hard on the dogs, yes? It's even harder on the humans. You ALWAYS have to know where everyone is and if they have had their needs met for the day. Not just food and water, but exercise, training and companionship. You don't go on vacation under these circumstances unless you can find help that can, worse case, break up a dog fight. You will also need an emergency plan. What are you going to do if the house burns or there is a natural disaster of some sort? How are you going to move dogs at the same time, under stressful circumstances, that don't get along? I personally had a huge Ford van that had crates permanently installed, but I was also showing dogs at the time.
Now on to the part that really bugs me. Dogs that bite humans because they are afraid. You don't like being bit. You company is definitely going to take a grim view of a blood and flesh donation. It is inevitable that someone at sometime is going to make this dog afraid and its going to bite them. You cannot control everything and if you had had the ability to train the dog or find a good dog trainer, that should have been done BEFORE the dog became a known biter. This dog is now a known liability. Your house insurance is going to drop you like a hot potato if they ever find out or, heaven forbid, you get sued. If you take this dog to a no-kill shelter you are going to find that they are going to ask you if it's a biter. Yes it is. Guess what? If you turn the dog into the shelter it's going to cycle the poor thing to a kill shelter where it will be put down. Conversely, if you lie and say no and the dog bites someone the shelter is going to put the dog down and come back to have a conversation with you about why you lied. So, rather than being put down with someone who cares, its going to be shuffled, frightened and confused and then put down. Ugly? Yes. Heartbreaking? Absolutely. But consider, would it be more or less ugly and heartbreaking to have to deal with the consequences of this dog seriously injuring a human? Taking on a dog that has been abused or has "issues" takes skills. A dog that is a known biter takes LOTS of skills and liability insurance.