A while ago I helped fellow forumite H3ADShOt3 work on some keyboard parts for the RBHP. Life got in the way for him, so I took over the files with the intention of giving them the last bit of polish they needed, then giving them to espher. Life then got in the way for me as well, and these upgrades have been sitting on my hard drive ever since. I figured by this point other people would have filled in the gaps, but I recently discovered those gaps are still there.
I've created a fork of the Project on GitHub, and I've begun adding keyboard upgrades. You can find my fork here. To start with, I've added upgrades for Radiohead's "Creep", the "original" version of "Tom Sawyer" (not the cover), and "Free Fallin'". I'm fairly confident the files are good to go. I've made sure to include the other upgrade bits where appropriate, so that anyone who adds keys won't lose anything else, like harmonies or chart fixes. I'm also fairly confident the new charts themselves are good to go. Expert pro keys got the most attention, but I think H3ADShOt3 and I had finished all other difficulties and five-lane charts as well, save for a few last-minute fixes I discovered today. I might have overlooked something else, so definitely let me know if you see something broken.
Other upgrades are on the way, so stay tuned! Of course when espher finds time to work on the Project again, I'll ask if he wants to pull these into the main batch.