The current behavior is that you generated the crcs on the command line once running bitbake, but I wish to have an option or tool for actually updating the .bb recipe. I think it would be more convenient for me than manually copy/pasting. We used to have such options on other distributions like Archlinux with makepkg back then.
There is a tool that is being worked on in the background that we will be releasing at somepoint in the future
With "devtool upgrade" now available in master / upcoming 2.0, I think we can finally call this one done, so I'm marking this as resolved.