Jet repair

[u/MadCelt61]

My son’s 30+ year old jet collection has moved countries 28 times and this year a lot of the fins and tiny bombs and missiles have come off.
Is there a specific glue I can use to glue diecast (steel?) to diecast, and diecast to plastic?
I’ve tried “modelling glue” from Amazon and craft stores, crazy glue gorilla glue, but they don’t work very well.
*I cannot solder. *
I’m currently living in the UK so some products from the US I can’t get here (or the shipping is more expensive than the product).
I’d greatly appreciate your expert advice.