I haven't tried it with that particular pack but with maybe a dozen others. Two that I owned and the others while teaching Wilderness First Aid (for pratical exams, students bring their pack as packed for a trip and then have to deal with a surprise scenerio using what is on their back. Those stays make great splints for various fractures).
Every pack I've tried it with was easy to remove and easy to insert the stays back. One reason a thoughtful designer should allow that is so the pack can be laundried more easily.
If, somehow, that isn't true for your pack, I'd suggest you modify it so you can. Because of that first aid application, laundrying, and also so you can drop weight when you don't need the added support or when you get your support through, say, a CCF pad packed against your back.