340 is in GMC2's space, but infringes Bravo, so GMC2 would probably give push back:
"Pushback approved, face south, pull forwards abeam stand 342"
Then for taxi it would be "right on Golf, Echo, Hold at Echo2" which is the handover point between GMC2 and GMC1
Then, when it checked in on GMC1, the instruction would be:
"Right on Alpha, hold at PLUTO"