I developed a simple method of attaching synthetic pouches to
conventional pouch boards.  I never tested the pouches in a stack but
did determine a relatively easy way to make them.  The method involves
making adhesive rings out of supported (stuck on a thin film carrier)
transfer adhesive.  Acrylic adhesives of this sort will last a very
long time and do not creep.  The adhesive is stuck to a paper layer
before punching.  The carrier (polyester is recommended) will keep the
rings relatively rigid even in the thin cross section required to fit
pouch boards.  A suction-well is used to form the dish and hold the
plastic while attaching the paper/adhesive/polyester film ring.  Then
the perimeter is trimmed.  Production methods would be a little
different, but could produce pouches pretty quickly.

If anyone is willing to experiment with some of these, I would make
some to try.  Saran does seem like a good candidate as it is long
lasting, very tight bonded, and resistant to hardening or other forms
of deterioration.

Best regards,
Spencer Chase