Rerolling was the best part of IB and HoW for me, so what if the same method employed in Armsday purchases worked for IB gear? You could turn your IB weapons in to Banshee and then on Armsday you could get them back and choose one of three random rolls at reduced light or something. I got four Weyloran's Marches this IB and none have any of the perks I was searching for.