As I said before I don't have a strong feeling on this but my reasoning that it works in that FFG have made a clear distinction between 'Attacking an target in Front Arc' and making a ' Front Arc 'Attack. It's the reason Dengar cannot use Fearless but can use his ability.
Outmanoeuvre uses the wording like Fearless , which, strange though it may seem, doesn't care which arc your target is in it cares what the arc on your weapon is. The YV-666 cannot use Fearless as well and the arc printed on it's gun is wrong. So following the Fearless ruling the YV-666 cannot use Outmanoeuvre either as it cannot make ' Front Arc 'Attacks. Krassis isn't changing your Front Arc Attack to a Rear Arc Attack rather just letting you use one in the other.