Being a late 19th century dandy, the guy will carry a sword, probably hidden, like a cane sword/walking stick sword. Everybody carried weapons it will have to be a weapons based art, and the 8 chop knives of chun won't cut it for a dandy, too heavy to brutal (if im getting the persona right).
I would go with a wu-dang/tang sword style, hsing i/bagua type stuff, something with elegance thats going to reinforce his personality, as far as I know (which aint alot) chun would have been very much for street thugs, the same with southern mantis and other hakka arts, and the long sword stuff of wu-dang would (probably or could be) a asset/compliment to his western rapier type fencing style, that he would probably have studied at some point. Or check out a few arts and create your own "passed down my lovers family deadly secret art that no-body lived to tell of, because anyone who has seen it has been an enermy and killed by it, untill the dude learns off whoever kung fu"
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