Originally Posted by
golfmad
I think you're overcomplicating things. As long as you make sure that the bags are tagged to the location you want to collect them then - all other things being equal - they will arrive where you want them.
I'm a bit confused as to a) what the OP is trying to achieve and b) how it is all ticketed but I think i agree with
golfmad - your bag will follow you to DUS irrespective of subsequent flights you have from DUS (or LHR) to another destination (even if on the same PNR).