Hans Hagen wrote:
> 
> taco is the math expert ...

At the moment, I don't understand this math vs. typescript stuff
any better than the next person, I'm afraid. There are a number of
(perhaps conflicting?) ways of getting 'bold math' in your text,
and I have not the faintest clue which one is 'right'.

In the special case of iwona, it should be as simple as

    \hbox{\switchtobodyfont[iwona-medium]$...$}

or even

    \hbox{\switchtobodyfont[iwona-heavy]$...$}

but that needs a extensions to the typescripts.

See attachment for example and that extra typescript code.

Cheers, Taco