I haven't used the vim plugin but if vim commands work on each selection that probably gets you half way. Kakoune additionally provides 's' and 'S' commands to sub select down from your selection iteratively. you might select all words, then select the _ in each word, delete the character and hit ~ to capitalize the next character to convert a selection of words in snake_case to camelCase. I think it's cool.
>Btw the reason I haven't tried kakoune yet is that the command is `kak`, which means 'shit' in my native language, Dutch.
I've actually heard this either on a forum, mailing list or a github issue at least once, lol. It's unfortunate.