If I was going to use it as a kedge I would as you say put some cable on it; maybe 6' and the rest I would have a double braid line. I would not put any chain on it. The chain makes it want to lay on her side and not dig in! Then the whole thing would be much easier to carry in the dingy.

If you do any testing curious what you find. Also a lot of the Chesapeak mud is so thin she doesn't like to bury. So make sure you know what your bottom is.

Good Luck

Go Slow
Sail Far
Stay Long