Citroen Xara Picasso remote key fob

[XMG5]

The two rubber buttons on my remote locking/unlocking key fob have broken and fallen out. Has anyone managed to repair one with new buttons? I looked on ebay and have seen "repair kits" for sale but I'm not sure if they are pukka as Citroen do not sell kits nor spair parts for the key. At £125 a shot I am not looking to buy a new key + programming charge.

Any advice welcomed.