Watermelons are the closest thing to biblical mana in these times of extreme temperatures. I too aspire to become a watermelon wizard, but for my own benefit.
There's some tools take them easy to prep. I have a tool that's just a metal loop and it's amazing. Basically you just slice the watermelon in half then scoop out in either sphere shapes or long strips.
I'm not sure what the effort you're taking about is. Don't you must cut off a hunk and then cut it into chunks? Seems like one of the easier kinds of produce to prepare.