Haha! For sure....since every single one of my bikes has both AXS droppers and derailleurs (as well as one with Flight Attendant), I have been keeping an AXS battery in my pack for quite some time!
Although this is not a Bosch bike, Trek has wired the new GX T-type too....I have the X0 T-type on my Rail and it too is wired. That said, I wish the cable to the dummy battery didnt hang out as far as it does...I have tried shoving it back in but eventually it slides out...Im afraid it will...