You are afraid of harming the coil.
I am trying to imagine what type of situation might happen to destroy the coil and the only one I have would be if I dropped it and didn’t notice and ran over it with a vacuum or something.
I feel like the coil is something I knew would have to be replaced over time.
For me, I am less worried about bending them and more worried about getting the longer ones caught on something and pulling them apart.
Either way, it is a part which I do replace now and then.
I feel like storing the whole device someplace safe and buying the shorter coils were the strategies I use.
Whatever type of thing you might design, it would have to be “worth it” in a cost/benefit ratio. A pencil case cost a few dollars and protecting the M-1 is worth that.
Buying the long coils, I found I did catch the coil on things and if I needed long ones, that would have been an issue to solve for, but switching to small coils worked fine.
I haven’t had any of them bend. I have worried when I got them caught on things walking by.