What I want to achive:
A castsequence that puts out battlestandards based on wich zone I am in.

In AV, I want one char to cast Frostwolf Battle Standard and the next to cast Horde Battle Standard

If I am in any other BG I just want to cast Horde Battle Standard

What I have tried:
toon1
/castsequence Horde Battle Standard,,,,
/castsequence ,Frostwolf Battle Standard,,,

toon2:
/castsequence ,Horde Battle Standard,,,
/castsequence Frostwolf Battle Standard,,,,

toon3:
/castsequence ,,Horde Battle Standard,,
/castsequence ,,,Frostwolf Battle Standard,

and so on
I was hoping to get down the standards in different orders so that global cooldowns would not interfer with each standard, but seems that is doesnt work properly with more than one castsequence(unmodified) pr macro.

I can also do
/castsequence Horde Battlestandard,Frostwolf Battle Standard,,,
with different variations on each toon, but then this macro would not work in any other BG than AV.

So my question:
Is there possible to solve this without using a modifier if you are in one of the BG's and not using a modifier if you are in AV?