>
> I'm pretty sure that this bit won't work:
>
> text=<<reduce "$(mytext)$">>
>
>

I just recently did a lot of experimenting and (1) assuming that the above 
in deed is the problem, and (2) that I don't misunderstand the issue then 
FWIW here's a setup that I do get to work. The idea is to externalize the 
invocation with a $set and then, inside the widget, call the "name" of the 
set variable instead. Please tell me if I'm missing the point/issue when 
suggesting this.

Example:

title:Foo
test: (blank)

\define foo() This is $(arg)$

<$set name="arg" value="myarg">
<$set name="tmp" value=<<foo>>>
<$button>
    <$action-setfield
              $tiddler="Foo"
              test=<<tmp>>
    />
Click
</$button>
</$set>
</$set>

test = {{!!test}}


<:-)

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