I'll give it a go. Have you considered a new career as a Radio 3 presenter, they've got a vacancy now Andy Kershaw been banged up in the nick, and that other woman's gone AWOL. Your suggested musical accompaniment is inspired, but I can't help feeling the finale is always destined to be Chopin's Marche Funèbre in C minor...  
Good Man!  Chopin might be a possible alternative, but you're getting all "glass half empty" again.... and I'm not sure that Ravel's Pavane would fit, in that I cannot really grasp the concept of the Commer as a dead child.  More a seriously and dangerously wounded Giant perhaps.  Which puts me in mind of the various movements of Greig's Peer Gynt Suites, offering some interesting insights and possibilities for an epic tale of Wagnerian stature:
Morning Mood - a glorious sunrise. Andy wakes.
The Death of Åse - a tender lament, as Andy draws back the curtains and the sight of the Commer reminds him of day's task.
Anitra’s Dance - A swirling melody as Andy steels himself to face the tribulations of the day. 
In the Hall of the Mountain King - Now Andy really has started work, the dance with the Commer begins with tentative steps, but as he becomes more confident the music builds to a crescendo as the mighty Commer continues to stubbornly resist attempts to resolve the non-functioning clutch.  Cymbals crash and drum rolls sound as Andy reaches apoplexy and starts using the heavy hammers.
The Abduction of the Bride  Strings and crashing cymbals herald Andy ripping open the Scotch bottle, followed by a slow lament.  Solo violins rise, as he slumps against the wheel arch of the Commer in depressed exhuastion, and the remainder of the orchestra swells, as the CA community collectively offers further encouragement.
Arabian Dance  - A kettledrum beats, as Andy recovers and purposefully returns to the task. Moments of calm, thoughtful periods emerge, along with the inspiration to return the Commer to her rightful place as Queen of the Road. 
Solveig’s Song  - A soulful melody with joyous dance sections, as Andy alternately counts the mental cost of repairing the Commer and rejoices in the prospect (after bribing the MOT man) of bowling along the open road to France in mid-June.
I think that should do the trick   
 
  
 
MG Mark