You probably know, toggling case (lower vs. upper case) can already be done with Ctrl-Alt-u and this shortcut can also be configured.

For CamelCase conversion, ages ago I wrote a simple little Python script to just do that:
https://gist.github.com/eht16/52067a31f2d8cfc3c0fac87d2ab70e28

Configure this script in Geany as command in the "Send selection to" settings, like in the screenshot.
Then select some text and use Edit->Send Selection to->CamelCase. The script also tries to detect if it is CamelCase to convert to lower_case and vice versa.
For me this works fine since a couple of years.

If I find time, I'll put it in the wiki.
HTH.

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