The funny part is, in actuality it would be the Americans with the 2000 point force! I think one direction that could work is illustrated by the old Ambush scenario from BFG; the defender is caught flat-footed, and has to pass a test before they can do anything with their ships for the first two turns. So, in other words, imagine having to roll a command check for each squadron in a game of FSA or DW; if you pass, you can activate as normal. If not, then you can't activate and essentially "lose" your activation. Or, perhaps you can activate, but suffer some kind of penalty (like suffering a -1 to shooting rolls or some such).