So, it would have to be such a vague connection that no one would notice it upon hearing the name? I'm not sure if that's what you mean? I think Corinne is a pretty & modern take of Karen. If a secret nod to Karen is what you want maybe Wren would be a good option for you. It's a nature name (bird) that seems to be trending here. Aubra could work for Debra.
ohhh i like Wren! that use to be on my list!