L-Fn button repair on Olympus 2.8 Pro lens

Hi. I am looking for advise on if I could remove the L-Fn button from a lens that is no longer working and use it on a lens that is working but missing the L-Fn button. I don't really use the button but would like the working lens to be a bit more weather proof.

I don't really want to send it in and pay the $ to have Olympus do it if it is just a few screws. I am rather technical but can not find a manual or someone that has messed with this type of work.