jm ¤ÈòbÊho¦Ó¾Èµf'®Th,¶Î~gGV´RLGet a cheap #android phone which has the ability to remove the battery. Then put a piece of paper between the battery contacts & only remove it whenever you need the wallet.
https://whatsonchain.com/tx/ef60a513e51de3914ad1fc3086863daac0a60d2a47cc8a074c16902d58b17b34