More than a year ago, I had some interesting conversations about this and similar concepts with a friend who stopped playing PS in the meanwhile. He was convinced that a system that allows players to create secondary characters with somewhat advanced initial stats and skills would be a great addition, but needs strict rules and limitations to prevent abuse. His reasoning also took into account concepts of aging, limited lifespans and inheritance. These related topics are indeed interesting, but setting up rules that feel fair for everyone is a delicate task.
Back to the actual subject, I think that a somewhat restrictive set of additional features in character creation would already be a big help. Keep in mind that your actual, cumulative training costs for reaching a certain set of skills are not a static quantity, but really depend also on the development of stats like intelligence or strength over time, in conjunction with skill progression.Thus it does not make sense to request a very precise mapping from one set of skills to another one.
The concept which I would suggest here is the following. Add some predefined sets of stats and skills in the spirit of the "quick paths" of character creation. If the paths of "Warlock", "Knight", "Enchanter" etc were reworked for better balance, the same patterns could be used for that, simply scaled to a much more useful sum of skill ranks. These "advanced paths" of character creation may then be available in exchange for the overall time spent with a given Planeshift player account. For example, you could call that "loyalty" points or whatever, hand out one for every 20 hours spent online and assign some loyalty point costs to each of the advanced creation paths. Yes, I intentionally decouple this from skill progression of existing characters, because it really should not give PLers an advantage. Those will find it much faster anyways to grind their alts from scratch. Of course, such a system will benefit from a wider variety of paths, and none of them should be close to a fully trained character, which of course depends on your personal point of view.
I hope there will be some more interesting comments in this thread. The topic deserves some more attention and thought.