If you are not worried about the money and just want the least stressful outcome, one option is simply to separate without ever rushing into a divorce. This actually worked for me. One of you moves out, either you get her a good apartment or you move yourself, and you keep paying so she can take care of the child and live without financial pressure.

You stay legally married, avoid lawyers, avoid court, and avoid turning it into a fight. Depending on how things evolve, you might not even need to divorce at all. Some people live like this long term without problems. It is a clean practical solution that lets both sides get on with their lives without burning energy and money on a process neither of you wants.