Ok, now I just want to make a couple things kinda clear... First normal elves are not terribly prevelent. Many were killed outright in the draconic Ascension. Ishmael, the Jester of Death that was played by Dr. Zombie was a good example of how to incorporate an elf into Vasorn. Also you could be one of the roving elven bands that live on the fringes.
There's not a terrible amount of planar activity, as the dragons basically cut off Vasorn from all the Celestial, Abyssal, and Infernal planes. The transitive planes (shadow, ethereal, and astral) are still there, as are the inner elemental planes, but the others may as well as not exist. So I would need a very, very good reason as to why your shadow elf character exists (there is a possiblity that some of the ancient elven wizards might have shifted their survivors to the Plane of Shadow in order to avoid detection, but Shadow Dragons still roam those planes, so it might be unlikely, but still possible).
And the shadow template has some very, very nice abilities that one could get (regeneration for example) that would have to be evaluated on a case-by-case basis to come up with a workable level adjustment. So, those are some things to keep in mind.
Now, as for the dwarven grappler, that could work quite well (unarmed combat became rather big when weapons' training was denied the "lesser races"). You could have escaped to the Underdark, could have been training in secret as a slave, might have been in a draconic arena like Gortag was, or something similar. If it amuses you, I have made a grappling-based PrC that might fit your concept, and its in the PrC link in my sig (it's called the Isida Kep'Tukari, don't laugh I made it for a PrC contest where we had to make something based off of our screen name).
So, those are some things to think about.
