No, that would be a mistake! You may never get those plugs out. IMO, the heat/cool cycle with penetrating
oil (not WD40) is the best approach and you should do it now before it gets worse. Out of curiosity, did you find antiseize on the plug threads you could get out?
Anyone with an engine with aluminum heads would be wise to pull the plugs when you first receive it and ensure antiseize is on all the plugs. Ford Racing usually only puts
oil on the plug threads which can be a problem if the plugs are not changed for years and tens of thousands of miles.