Sometimes it is more of a conversation and an extra question or two will be asked. I heard, "What is your location?" where the repeated answer was a rough geographic one instead of something like a gridsquare. I hear a lot of phonetic responses with "loud and clear aboard the International Space Station" so maybe say phonetic callsign and just leave it at that to see where things go. But, most satellite voice contacts are the classic callsign gridsquare combo so that should work just fine as any sort of 'formality.'

Nice that you are being considerate and wish to keep the time on the air short for the benefit of others.