Excellent advice, John.  I have had good success with this very procedure.

A while back my brother and I discovered a large number of rolls of
processed and uncut 35mm B&W negatives made by our late father in the 50s
and 60s.  They had been stored, several rolls together concentrically and
tightly wound, inside their original metal Kodak film cans.  The goal was to
scan them for posterity and traditionally print some of them in a wet
darkroom for fun.  Their tight, slinky-link curl made both goals virtually
impossible.

We carefully removed the rolls from their cans and wound dry them in reverse
onto stainless reels.  Each roll was then pre-soaked, refixed, rewashed,
rinsed in isopropyl alcohol and dried dust-free while remaining on the reel.
Upon removal from the reels, the films were reasonably flat.

Before they could recurl (the ambient humidity was low) we then cut them
into strips and inserted the strips into traditional plastic negative pages.
These pages were then placed under moderate, full-coverage weight for a few
weeks, or so.

The result was strips of negatives with a radius of curvature well within
the (Nikon) scanner's engineering specs.  Although I have yet to print any
in my darkroom - they are still being scanned - I anticipate no problems
using the negative carrier on my Omega D5XL.

(Note:  Due to their manner of storage, the negatives are very heavily
scratched due to the binding effect when they were initially rolled up.  The
damage is such that the only technology with a reasonable chance of
acceptable restoration will be digital.  Traditional prints will have a
pronounced "historic" look from the scratches, but would be a hand-spotting
nightmare.  The good news is that half a century in tightly sealed cans has
left them pristinely clean.)

Ken