Chef...assuming the Chessie is your cruising ground for the forseeable future, I second your chain/rope combo plan...though I would go shorter on the chain...perhaps 40-50 ft...so that you will have more nylon out even in shoal anchorages.
They nylon will serve as your snubber so you need no other unless you lay to your chain only...which will only complicate things when you have the nylon rode available simply by letting out more scope.
I would not bother at all with a trip line in the Chessie unless you are planning on anchoring in Baltimore Harbor. To break out a stuck anchor, simply drive the boat up on the rode till it is vertical then snub the rode off as you drive the boat forward if the seas are too calm to do that for you.
There is no need for an anchor swivel and it adds complication and an additional point of failure.
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