A custom airfield is the better answer, but all MA terrains must use default fields etc., so that isn't an option until htc adds a larger (two part) field for the MA. All MA fields require bases no closer then 3/4 sector and each field has it's own tower, hangers etc and, requires it's own town with a maproom. Your suggestion would trigger or stumble over all this.
I'm sure this isn't what you wanted to hear, sorry.