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TBH Brompton rear triangles do have a reputation for rusting from the inside out. Other than internally applying Waxoyl or similar when the frame is new, I'm not sure what else you can do. Other than speccing Brompton's super light variant which features a Ti rear triangle.
ETA - Put it to @Rhobbs see what he says. -
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You should be able to do a bandsaw blade fold in them, and by doing so reduce their diameter to 10 or 12 inches.
https://tinyurl.com/u93ew4f6 -
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Nikwax do a 2 part proofer that you bung in the washing machine. It worked fine on a ski jacket I used to have.
ETA - Pipped to it by @tyeness ^ -
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Not sure that Brompton will deliver anywhere other than mainland UK.
https://www.brompton.com/support/delivery-and-returns -
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How many do you need? It cannot be beyond the wit of man to turn something like that on a lathe.
ETA - These exist: https://www.google.co.uk/shopping/product/18193275798965004472?q=lighting+spigot+adapter+metric&prds=epd:14661592049123683985,eto:14661592049123683985_0,pid:12416652778705064806,rsk:PC_11000621316080095057&sa=X&ved=0ahUKEwi2sLeUj-6AAxWrUkEAHfMBB8cQ9pwGCAc
But as they are from the world of photo equipment, they're imperial. -
It's XO bikes. They re-cycle s/h and unclaimed bikes. Apparently, they are the Met's unclaimed bike re-cycler of choice. They are staffed by ex-offenders. It is probably a legit deal.
ETA - And, as you say, given some of the upgrades fitted, it looks like someone loved that bike at some point.
https://xobikes.com/product/brompton-black-foldable-bike/ -
If you need slim spanners I have some in SE23.
ETA - Can also lend you some MKS pedals while you sort stuff out with TPW.