Hi, Jon;
I observerd that there are two basic raw material used in Soices' kbd labels: plastic and metal (aluminum?)
I succedd removing plastic labels in two Spices' cases easily: simply pulled them out and they almost "popped off". I'm not sure it's gonna happen with others. Also, I never removed metal labels.
You may see the difference when comparing both models: plastic labels have semi-gloss reflective surface, while metal labels have glossy frames. I have an HP38C with glossy frames and an HP31E with semy-gloss surface (plastic).
I am not sure if all plastic labels will be easily removed as well, I am not sure if climatic conditions would weaken the glue, but if you believe you can give them a try... It's a lot more easy to remove them when the crystal-red LED cover is removed. You will see the label border is easily sensed with the use of your own fingernails. And remember: if you decidee to pull the label, be shure it is a plastic one or you will bent it, if it is a metal label.
Success! And please, let us know what happened.
Luiz (Brazil)