So, in a moment of lockdown boredom, I thought what about a period Fire Extinguisher?
Searching Fleabay, the old 'Pyrene' Pump action type that were around from about the 1910s to the 1960s and were seen everywhere, quite prominent on buses as I recall from my youth, tend to command a quite hefty price; especially if they have a mounting bracket. which few do.
But I noticed there is a Nu-Swift extinguisher that is of the 50s/60s, unlike the Pyrene model it is pressurised, not hand pumped.
They're still filled with Carbon Tetrachloride, which is Montreal Protocol 2010 prohibited chemical

So I managed to get one for £30 and it arrived looking like this: This particular model has the pressurised container inside an external body, because the original model was a simple 'Strike Top' and it discharged until empty, but then the brought out this lever action model.
It's now cleaned up and ready to go in the car, with or without it's 70 year old innards.
I'm thinking I might mount it on the floor beside the drivers seat, I'm not sure yet.