Petra, I don't remember where I read this, but "In matters of the heart, often the right thing is the most difficult". Trust me, anyone with empathy would not judge you for trying to find the best solution for Otis.
Several years ago a member of our dog park group had a young basenji he (and wife) adored. They got another rescue German Shepherd, and had a baby. Suddenly the basenji was not the center of the world and some negative behaviors got much much worse. Separation anxiety, soiling, very stressful for everyone and he was looking at rescue. One of our group contacted a classmate who had a male basenji, and after a weekend trial they took this little girl and immediately all her issues were gone. Dog is in a home that fits her better. Did the first owners love her, heck yes, did they want the best for her , yes! Did that mean finding her a home that was abetter fit for her, and them, at that time in all their lives…yes. The story has very happy endings, basenji girl and new family are very happy together, old family is happy, and glad to know their basenji is well loved and safe.
Sometimes things don't work out in spite of much effort. If you can help Otis find a loving home, you will be doing a wonderful thing. Maybe he needs a quieter life, less stimulation, who knows, but you can't risk keeping a biting dog around kids who may trigger the behavior. We all understand that!
Hugs, fingers crossed that things work out for everyone!
Anne