doubt the insurance company will let you swap anything over, regardless of if its on the policy or not.
however, if its on the policy, and its not there, they will deduct it... (ie, i had my stock rims on my car, and i had sparco rims on my policy, and they dropped my payout figure $2000 due to the rims not being there.)
if you need the money for another car asap, just take the payout, but if you are willing to take the car apart, and sell it over a few months, you will recover some of the lost costs..
ie, i paid $4000 for my wreck, and so far i've sold atleast 1.5 times that and ive still got my rims, most of the interior, panels etc.
Some of the parts, like the front and rear calipers and rotors were also put on kylies stagea, so there is more i could have sold.
what's damaged in the front of your car? its more parts from the front, than the rear (of which mine was rear ended) that you can sell, so it might no be worth buying the wreck.
good luck with insurance, make sure you get on their back everyday to speed up the process, and go get checked out by a doctor if you have even the slightest of pain in your neck.
i had no pain the day of my crash, but that night i couldnt move my neck, and 3 months on i'm still getting pains.