501st box questions

Besides all the bad things about this box, I still got it, and was just wondering about two things:

1) what to do with all the flying arcs with only 6 (4 useful) flight stands. I’ve seen people say there are work around, what are they?

2) i got this box because I didn’t have any arcs, and since each comes with echo and fives, is there any point in making them three times? Or should I just put a helmet on and make a new squad of arcs with just the extra? Because what’s the point of having more than one of them since you can’t put them in an army twice?

Thanks :)