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https://www.soudal.co.uk/pro/products/sealants/putties/universal-putty
Give them a call and see if this is suitable or what they recommend. Generally technical departments know their stuff.
That’s actually a good idea if there’s a product out there I could roll out a long sausage tapered to fit. It would need to have some compression/flexibility after curing and withstand -10° to +40° as the gap between the glazing is like a mini greenhouse.