My expected devices which will be charged by this system would be those which do have LiPo batteries, but would also have internal charge limiters, i.e. iPad, iPhone, Bose external bluetooth speaker, etc., so it's really just a matter of supplying (output) a reliable 5v, 12v, etc from a source battery that will fluctuate based on the status of its charge from 9v to 12.6v.
That said, thanks for the tip on the above part, but it seems that's only available in 1S and 2S variants. Nothing that'll handle 3S seemed to be available, and since I'm not charging other non-charge-controlled items (bare LiPo batteries, for instance) I'm not sure it's something I need.
Good stuff though, keep the ideas coming everyone.
Thanks again.