So, a few points on this idea (which I think is a good one to discuss, although I personally would never do this).
1) We can't really call this a "tri-spec", since it has absolutely no truck with points in Unholy. You just don't have the points to be able to get all the things in all three trees that make the tri-spec build work. (Also, don't say "tri-spec" when you mean "dual-wielding"; the reason it ends up in all three trees is to prop Dual Wield up enough to make it closer to the standard 2h builds.)
2) If I had to make a build that had both Abom's Might and Imp Icy Talons, I'd make something like
Talent Calculator - World of Warcraft, and focus on wielding a 2h instead. That way, you can still rip it up with Heart Strikes without wasting your time on the frost talents that don't do anything.
3) If you've got your heart set on DW, then of course you need to center your build around Howling Blast instead. You might manage something like
Talent Calculator - World of Warcraft. Frost Strike is still your RP dump, since it owns face all day and dosent afraid of anything. You Howling Blast as much as you can and Obliterate the rest of the time. This build would be seriously lacking in personal DPS, however, since you don't have the Necrosis and Blood-Caked Blade damage from Unholy.
Phew. Long post, but there it is.
Edited for bad links - why doesn't my HTML work waah. =(