Looks like some good possibilities. Other options might be Irish 2-seat TrMkIX (apple green with yin-yang national markings), Dutch MkIX (silver), and how about a bright red G-FIRE? You could substitute a IIa for one of the Ias as well, or have an early MkI with either silver undersides or night/white and the straight top canopy.

If you are diverging sufficiently from the ‘true’ Spitfire bloodline to have the Attacker, why not start with the S6B or the F.4/34? They would be different alright!