The only problem is it being a "fixed" piece.. At least I don't go popping klickys after they're done... I suppose if the neckpiece wasn't fixed, it would be possible to use a non-fixed cape too....
The way I get around this is to use the Fi?ures skeletons and heads in customs. They are made in a way that they can be popped off whenever needed, without using any of the old methods. They have somewhat rounded "lock-in" parts on the head pieces that allow for this. It's great for customising, and you can just pop them without worrying about doing any damage to them after they are complete. I know what you mean about finishing one and leaving it, but with the new Fi?ures parts, this can be basically forgotten.
I reckon I'll be using the Fi?ures heads and skeletons for all customs from now on, so I should be able to make many more and test out combinations much easier.
As another note - I haven't tried it since I don't really like to physically alter the parts - but I suppose the older heads could could filed down to allow for the same ease of subsequent poppings. They might be loose after this though, as they won't have been done perfectly by the moulds.