King Rat,
Your fantasy of 42 freighter Capt.'s coming over and taking mainline f/o slots is exactly that....a fanatsy. Haven't met one yet that is willing.
Next, there will be no problem filling the seats if they do. 30 CX f/o's applied for the last posting for freighter left seats. Not to mention the 47 freighter f/o's who can easily fill the seat. Hmmmmmmm......back to the drawing board my friend.