Yeah, something like Heroes Of Might and Magic. You had an option to skip battles with: Quick Battles (no auto-battle where IA controls your unit but also could be great too)
An easy way to simulate the combat: How many enemies and their level equipment, vs how many Xcoms and their equipment and stats. Then a random number to know who will fire first and if will die his objetive. Do after either aliens or xcom wins.
Dunno if you can do the battle controlling the xcom, but on background, in a faster way...
So, could be great if you work where you can give Xcom an IA control, and let the player to control Alien. So at the end, you can give a Player Vs Player in same machine!!
Also, i like what Shoes said. Just Nuke the ufo!!!
But for that you need to develop some kind of Nuclear Weapon... (why to use an interceptor if you can hit them hard XD)