Just start a company and make sure you document that the company you created is doing the work and not you personally. That'll probably throw a spanner in the w

Just start a company and make sure you document that the company you created is doing the work and not you personally. That'll probably throw a spanner in the works if it ever did get legal. You could say a contractor did the work then I guess. Obviously I'm not a lawyer and I'm probably totally in the wrong but seems at least another layer of safety over you just doing it personally if your employment contract says your employer owns all IP regardless of when its worked on as long as you're employed by them.