I, too have SWWAS and Red Steel/Alamein. Rules for Red Steel are not bad at all. Haven't read Alamein, but I do know it includes more rules for supply and air than Red Steel does.
SWWAS can be soloed (there are rules for solo play
HERE). I would suggest trying one of the convoy scenarios from Bomb Alley rather than the CV vs CV battle in Coral Sea for solo play. For me, the CV battles really shine with a live opponent. Avalanche Press has a free VASSAL module for Coral Sea
HERE if you want to try it but don't have anyone to play ftf.