Good idea, but I don't have any, or the tools, but I worked out a slightly better bodge. 
Popped to the local DIY shop and acquired some M6*25 bolts and nuts (only need 1 bolt!).
Inserted a bolt up through the hole from below and attached a nut from above. Checked location, length, ability to fit trim and then tightened the nut really hard to make a captive bolt.
Another nut and then a big washer and one more nut and we had a "platform" suitable to support my existing trim (after a bit of levelling/tidying on the underside).
Finished off with reusing the grotty washer from the original bodge (happened to be the right size) and final nut. Not elegant but it holds and can fairly easily be undone.
Could do with a cover for that recess though......
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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