Joining the parroting?

As we all know, models really like to parrot messages in some way, with Claude, for example, It really likes to do 'did you really just...?' or something along these lines. Have anyone tried embracing the evil to it's fullest and just using a prefill to have the model repeat your message verbatim?

I don't have neither the funds or the time for extensive testing right now, but from initial impression, it feels like it scratches the parroting itch of the model and lets it continue with the actual dialogue naturally. Or I'm just going insane and imagining things.

So yeah, anyone tried this approach? And, more importantly, is there a macro for getting the message and shoving it inside the prompt or this is the territory where one would need a custom extension/asking the model to echo everything and waste tokens?