I had several connections to make today using 729 strand litz wire and
it took me no longer than 10 minutes to prepare and solder the ends.
Using the technique that I described before on here. Spread the ends
out, dip in paint stripper for a few minutes, then brush off the
disolved enamel with a tooth brush, wipe and clean  with white spirit,
then twist the wire to get it back to its original diameter and solder.
The perfect connection, patent applied for, it seems no one that I have
spoken ever thought of the idea.
Most professionals follow the clumsy time consuming solder pot procedure
and radio amateurs dont have a clue how to handle litz.
G3KEV