yes! my youth counselor told me to try that. at first i got the same angry/defensive responses. but in time that changed and my little have written pages and pages... drawn some pictures, done projects. I've learned a lot about them and what they went through that way.
your brain has control over your dominant hand moreso than your non-dominant hand. that is why it works, you can get around the censoring part of your brain.

it can be emotional, but i keep a bunch of coloring books and crayons around to soothe. kiya