When I special ordered my Nitro it had every option EXCEPT the "Smoker’s Group" and the "engine block heater". Didn't really think about it till you brought the subject up, what that option contained. There are Sites "Online" that sell replacement ash trays for vehicles of the past in the 50's and 60's. Guess anything could be modified, but with all the plastic now used in dashboards (not metal) it could become a fire hazard.
Welcome & Good Luck and maybe we can be more helpful on your next Nitro modification.
Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options