What are possibilities of balancing 3-phase consumption?
Instead of rerouting load, intelligently adding home-made power production is the future.
Disconnection of something with a cpu in it (everything beside a hot iron)is a bad idea.

In Europe, where even the smallest villages have 3-phase connection to every home, solar panels with LiIon buffer battery are hot. A 100W panel is ~300€ all inclusive. The DIY part would be the intelligently giving the selfmade power to the most loaded phase and only when it's assymetriccaly.

A friend did that with a small river generator in order to save penalty from the power supply company.