Setting L2 part way through training

Is there an easy way to set L2 part way through training, rather than just when the model is created? I can see how to vary the learning rate on an existing model but don’t see a corresponding L2 method. Should I be creating NeuralNetConfiguration and attaching it to each layer of my existing model?

Nope - that doesn’t work.

It looks like I need to make custom Schedule.