I (IMHO) like the SRT Wing. Having had a Fiero GT with a SUPER WING...the SRT is just a baby!
Anyway, you don't really need the entire decklid...only the deployable wing area.
The linkage, wing and motor and such are contained as a unit. The wing is the only thing that would need to be painted. The cover is grey and the linkage is black.
The SRT has the wing bolted to a flat plate that is bolted to the trunk/hatch in the same area. Again that plate (not the same plate as the wing on non SRT) and the wing would have to be painted.
I would think you could merely mount a MANUAL switch to raise/lower it, like a power antenna switch. No AUTO deploy, but a easy swap with function.
Anyway, without actually performing the swap (YET) I will swap my LTD Roadster deployable Wing for your SRT Roadster Fixed Wing.