Is it possible to access the areas within stormblood to do the DRK quest without progressing the SB MSQ?
Sadly, no. Pointless MSQ gating of areas is still a thing they've yet to abolish and probably never will.
That said, all your skills and traits; save for you last one, come from the leveling process. So you aren't missing out on anything that will prevent you from playing your job, just a really good questline that gives you gear and your final action at the end; which you really don't need until you're at the end of the MSQ anyway.

Quote Originally Posted by NephthysVasudan View Post
If i recall the furthest I got in SB areas was the fringes...MAYBE the peaks..
The last two quests are in The Fringes and The Peaks. Everything else is in 3.0 areas.