changing alignment inside a paragraph

[mf <massifr@fastwebnet.it>]

Hello list, is there a way to achieve this?

\def\FlushRightFromNextLine{\relax}
\setupnarrower[left=0cm,right=11cm]
\setupalign[stretch]
\starttext
This is what I'd like to type in my source:\par
\blank
\type{This is the text of an index term, that is normally justified,
but I'd like the page numbers to be flushed to the right from
their second line \FlushRightFromNextLine 34, 57, 101-104, 276, 345, 
401-403.}\par
\blank
This is the normal result:\par
\blank
\startnarrower[right]
This is the text of an index term, that is normally justified,
but I'd like the page numbers to be flushed to the right from
their second line \FlushRightFromNextLine 34, 57, 101-104, 276, 345, 
401-403.
\stopnarrower
\blank
This is the expected result:\par
\blank
\startnarrower[right]
\parfillskip=0pt This is the text of an index term, that is normally 
justified,
but I'd like the page numbers to be flushed to the right from
their second line 34, 57,\par
\penalty10000 % no page break in the middle of page numbers
\startalignment[flushright]
101-104, 276, 345, 401-403.\par
\stopalignment
\stopnarrower
\stoptext

The expected result is to be intended visually, because there might be 
no need to break the text into two paragraphs.

Thanks,
Massi
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