reverse channel order for 1 multi head fitting

[sheddo]

Hi,
Is there a way to remap the channels for a luminaure?

Basically my scenario is I have several linear LED Pixel Bars, Which are essentially multi head RGBW luminarres. I've got them broken into 100mm sections, however due to the mounting arrangement one of the luminares is backwards. ie if I run a pulse along the string, the luminire in the middle pulses the wrong direction. Unfortunately I can't just mount the luminire upside down!

Basically what I need to do remap the channels;

from
R G B W / R G B W / R G B W
42 43 44 45 / 46 47 48 49 / 50 51 52 53
to
50 51 52 53 / 46 47 48 49 / 42 43 44 45

Cheers