I have been working on Plan B, statically linked binaries and libc. So far, the time I have spent on that has been helpful, and I do not consider it to have been much of a diversion away from Plan A. That is because I have been finding and fixing problems that I would have had to deal with under Plan A, anyway, had I gotten past the problem with _ld_libc().
For example, the unimplemented functions, _lwp_pcb_exit(), memchr(), many of the setup problems, almost all would have been banana peels on the Plan A road, as well. -- Guy Shaw