Er, sorry, did you mean that as in "That damn Innocent, always messing things up!" or as in "Screw Innocent! Who cares what he thinks"?
Another idea I've had is for Arthur to marry Isabella of Angouleme after John's death (or would that be forbidden under Leviticus?) and giving his sister, Eleanor, as a bride to Hugh IX of Lusignan's son (who IOTL married Isabella after John's death) as compensation.
As for Arthur's relationship with Philip II and Louis VIII, he's about the same age as the latter, and he had spent a few years growing up in Philip's court. Apparently, Constance of Brittany did that as part of continuing his father's pro-French policies. The way I see it, Arthur having spent time in Philip's court from a young age could mean that Philip could find Arthur a bit more pliable than his uncles, but it could also mean that Arthur may be a bit more knowledgable and/or savvy than John in terms of negotiating with his feudal lord. I.E. if Philip, as he did with John, summons Arthur as Count of Poitou, not Duke of Normandy or King of England, Arthur would probably do so.