And every year people wear whatever shade of poppy focusses their own thoughts and remembrances. The choice is theirs, there is no need to wear what focusses someone else's memory.
The traditional red poppy flourished in the broken earth of civilian fields and gap sites in the city where bombs had dropped and civilians died, as well as in the ravaged battlefields. You could wear the cornflowers or moon daisies or corn cockles that flowered beside the poppies. Poppies also come in purple or pink, just as prolific, and there are yellow and orange ones too as well as white. They all spring up in damaged earth, and how about purple buddleia, that other plant of derelict places?
No need even to wear a poppy at all, unless you wish to be seen to be remembering. If you remember without advertising it, does that negate your remembrance?