Cool!
Last word on this, in the course of thinking about my idea, I’ve discovered that there is actually a d20 system based on the Dying Earth! It’s published by the Pelgrane Press.. List of abilities :) :–
Appraisal
Athletics
Concealment
Craftsmanship
Driving
Engineering
Etiquette
Gambling
Imposture
Living Rough
Pedantry
Perception
Physician
Quick Fingers
Riding
Scuttlebutt
Seamanship
Seduction
Stealth
Stewardship
Tracking
Wherewithal