Flip an xcursor in the console

I'm left-handed and I want to be able to correctly flip any arbitrary xcursor theme so that I can use it as a left-handed version. I’m surprised this isn’t build in. So a way to flip an xcursor file, say /usr/share/icons/Bibata-Original-Ice-LH/cursors/pencil, would help me do that. I expected it to be as simple as convert pencil -flop pencil, but Imagemagick doesn’t support xcursor files, it seems. And scripting it with Gimp’s script-fu would work, but when using gimp-file-xmc-save it expects me to set the hotspot and such, and I can’t find any way to find the old values from the existing file I opened (let alone the hassle of learning Scheme just to do the math to get the flipped values).