this has worked for me a few times
first off what you need is to be able to do two tracks of some sort while non shifted
2nd you queue for a battleground with your secondary track on the one you want to not show up as being used but still work
3rd when you are in the battleground wait until it starts then switch to your primary track and you will need to die at some point before bg ends
you will notice it will keep switching back to the one you originally entered into just keep swithcing to the primary one every tiem you rez and have it up when bg ends
finally when you come out your minimap will say you are using the primary track but the secodnary one will also work like say track minerals and humaniods at the same time
ill test this more just to make sure i explained it right i didnt find another post about it so hope there isnt one