Double ber CoA has more applications. Imo, don't swap and if you want the CoA with the 40/9str in it, trade other items/fg instead and have both CoA for different setups. But again, double ber is just better in general vs most melee related stuff and easy to get DR in that slot.
If it’s usable I’ll buy another for the swap, no problem. But if it’s not usable in any set up I won’t make it… i don’t know if a 46dr set up vs mele is just stupid… or i can change those 4% dr points for 400 more dmg…