The Lads, my older friends, all enjoy going down to Agros enormous plot and spending the day for a yuppie shoot, firing rifles at cardboard cut outs of Zombies, stapled with packets of simulated gore. What if... Aliens turned up?
The GM would suddenly be hit by a giant gob of green plasma and instantly killed. The rest of the Lads would freak out, take cover, and encounter the little grey men.
Afterwards, the remaining lads would be picked up by a proper military mob and flown back to the Headquarters for interrogation. Of which, they will be recruited as a rapid response team for Xcom.
From there play it like new Xcom, where everyone has a class and earns abilities with each Rank and few digits and stats compared to classic, and cross it with Apocalypse with a Brisbane City Layout. They'll have a main base set somewhere near Central Brisbane, and they'll get UFO Contacts and Exalt Attacks as normal, but locations based around Brisbane.
Have a UFO crash into the City Hall in King George Square; Save your Operative from Exalt in UQ; Have a Chryssalid Hive wash up in Pinkenba before calling in an Airstrike. The possibilities are endless.
Every week would have a new encounter of some sort, and rather than having behind the scenes crap for Research and Spending, it would be a general consensus each week. And everyone would be conveniently healed at the end of the week, and an operative would be sent off at the end of the second or third week. Or better yet, someone who's missing for a couple of weeks is automatically an Operative, and first night he's back he has to be picked up "because exalt have found him as he's transmitting information back to base."
I wonder who would volunteer for MEC Trooper Augmentation...