Hi folks, hope someone will be kind enought to help.

I am based in the UK, and am using some virgin miles to fly out to USA (a one way reward ticket). I then want to pick up my Done4 in the USA, say at JFK. Heading west around the world, my return flights to USA would likely stop over in the UK/Europe at LHR/other? Is there any way to stop off at this point in LHR, and throw the remainder of the ticket away, thereby avoiding paying for Europe as a continent. All of this allows me to include Latin America instead of Europe (which I have travelled well), without adding an extra continent.

My main concern is through checked baggage?

Can anyone suggest how to do this? Is it possible?

I would be extremely grateful for any suggestions as to how to do this.