I'm not sure how I would respond to this suggestion. My T tells me I'm way too much in my head and so I have tried some things with her that my analytical mind rejects - for example - sand tray and working with figurines. And when I let my defenses down, they did provide some fascinating insights.

Imagining a childhood trauma, though, and substituting T in the scene would be tough for me. I'd have a hard time 'believing' it even if I trusted T totally.

I guess you have to ask yourself how much you truly trust T to engage in this exercise. Sometimes I've tried some stuff at T's suggestion but within minutes I see that it's not working for me and I say "I can't do this." and we stop.

So, maybe you could try (if it feels o.k) and if it isn't working, don't continue with it.