Rakudo can't do that because...
Well perl-6 can't do that because you can't run perl-6 without a runtime to
figure out things like method dispatch and to manage garbage collection
and other things. Someone could write a linkable library to provide that
but that would only delay perl-6 actually coming out so GET RIGHT ON THAT #perl6!
Rakudo can't do that because it uses a modified Xeno's Paradox for its development process: every time it gets halfway to completion, someone decides to start a port to yet another backend (or rewrite something else from scratch).