I've never played a Nord.If it's an 88key board you will have to angle it a little, or pull the passenger seat up some. Go for an Electro3/73.
I can get my power amp in a 2 space skb case, and a 4 space roto case with eq and an AMA122 preamp, a nord electro2/61 (B3 clone), a privia or kurz 88 key board, two speakers or a single stereo speaker rig; a stand; bag with cables, etc and a seat in my 3 door SVT Focus. If I go to PR10 speakers and a sub, I bet I can get a rig into a 5-door fiesta - we'll see. I want a smaller more fuel efficient car but I have to use it as a gig-mobile.I've never played a Nord.
If I do get back into music, it would most likely be a 76-key synth.
Problem is, I've always used 2 keyboards on stage, plus a stand and all the other gear. I can't imagine all that would fit in a Fiesta.