It seems to me that an umbrella could make a handy left handed weapon, much like a sword cane with some concealment and possibly cover options, There does not deem to be much development along the lines, basically canes with umbrella parts and no swords, let alone concealment or cover provisions.
https://unbreakableumbrella.com/product/unbreakable-telescopic-umbrella-model-u-212s/?affiliates=18
https://smile.amazon.com/gp/product...b7d7ec0f0dbd999fcb73303d&tag=thesurvivalha-20
https://www.amazon.com/gp/product/B...a-20&linkId=b64b3cbe10ea4768edf2d28eed3663f4b
https://unbreakableumbrella.com/product/unbreakable-telescopic-umbrella-model-u-212s/?affiliates=18
https://smile.amazon.com/gp/product...b7d7ec0f0dbd999fcb73303d&tag=thesurvivalha-20
https://www.amazon.com/gp/product/B...a-20&linkId=b64b3cbe10ea4768edf2d28eed3663f4b