Please advise.

I am a few flights into my AONE4.
I now want to make some changes.

Upcoming itinerary includes:
LHR-WAW (16 Sep)
WAW-LHR (19 Sep)
LHR-DXB (20 Sep)
DXB-LHR (23 Sep)

Can I change the itinerary's sequencing, without charge, to:
LHR-DXB (August 24)
DXB-LHR (August 31)
LHR-WAW (August 31)
WAW-LHR (Sep 05)