DIY cavity foam ?

There's a few square meters of my house that missed one of cavity wall insulation or dry lining. I'd dry line these walls but they have radiators and windows etc. on them, which makes it messy, and the effort per square meter seems a lot.

Is there a DIY insulating foam available, similar to expanding foam but perhaps in bigger containers that the wine-bottle size foam I see tradesmen use.
(original build was early 1970s house with cavity wall but no insulation)

I'm fitting new windows soon, so access is presently easy.