Deathwind,

I have looked for a similar vest many times. The closest I have found have been milspec aviation vests with inflateable PFD's. Similar to Mustang's: http://www.mustangsurvival.com/professional/msv971?division=military&country=25
or the LSI:
http://www.lifesupportintl.com/products/Life_Preserver_Survival_Vest_MK_46_SV-1381-581.html

I have seen tactical vests with flotation inserts but none of them are Coast Guard approved. The LBT is a good example:
http://lbtinc.com/vest-h-gear-carriers/vests/tactical-vest-w-flotation.html

Needing these items, you might try a survival vest over a good PFD. I have used this concept many times with success.

Respectfully,

Jerry