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Probing for info.
Depending on the output of the error page you can slowly build up details of the tablets and stuff. (was about 5 years ago I done it but something along those lines iirc).
Bespoke parts y0.
IIRC only one of the 2008 24" iMacs has an interchangeable card. Still, it's not an off the shelf one and is circa £350 just for that.
On the rest the graphics are part of the main logic board.
My 182 had what you plan and I had ABS/serv/airbag light and it passed MOT fine.
Although you could get rstuner or clip and disabled airbags all together? (Will get rid of the light iirc).