Since you are able to copy and paste those instanced objects though, why don’t you manually do that to transfer it to the BP default? Sure, it’s not optimal, but it can be done still, and it’s not too much of an effort to copy and paste, and I think it will solve your problem, unless I misunderstood what you want to do. You should be able to copy the array of uobjects from the array of the instance, and then paste them in the BP default array, which should then be propagated to all instances after that