No clue on the eucs as I've honestly never even heard of it... If @TrollDragon won an authentic BB then it comes with a bridge in the box these days.... The included bridge is similar to the Kangaroo and takes Kanger coils..
When I was using rebuildables in the BB I'd rewick about every week or so but I vape plain vg/pg base. The only downer I see with rebuildable options in the BB is there really is no way to dry burn the coils for cleaning.
Taking a rebuildable out and putting it back in? No difference than if using a bridge..