rakudo, nqp, and moarvm have just had releases on Github. I'm not sure if this would also be a good time to implement #704962 as a lot of this release's internals have now changed to use the Raku name.
I was able to emerge these by changing the versions on the ebuilds and changing:
The SRC_URI in rakudo to:
And changing the moarvm version in nqp, since moarvm has a .1 and isn't exactly the same version number.
All three packages have been updated to 2020.02. A simple rename of the ebuild installed just fine for me.
Are we missing a maintainer for this? If so, I would like to volunteer to help with keeping these packages updated.