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https://www.smooth-on.com/product-line/foam-it/
Stuff like that gives you more control and probably goes up slower than the builders bodge stuff.
...it will explode. Probably.
I have a feeling that anything which expands hard enough to provide a worthwhile structural effect will blow the sides out, unless you have a mould to fit the wheel. Building a suitable mould seems like more trouble than just buying an Aeox