I'm unsure why you have two separate macro calls in your example.
Regardless, maybe this works:
\define image-inner() [img width=80 [$(caption)$|$(tiddler)$]]
\define image(tiddler)
<$vars caption={{$tiddler$!!caption}} tiddler='$tiddler$' >
<<image-inner>>
</$vars>
\end
<:-)
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