Polaroid transfers move dye from the color negative to another substrate,
usually watercolor papers like Arches.  You may be able to use the ortho
like a dye matrix film to soak up dye and then subsequently move the dye to
another substrate but that would require three images in three colors to get
a full color transfer and registration pins to get all the images in
register.  I'll be fascinated to hear about your results, sounds like fun.

To stip an "emulsion" from a glass plate, the emulsion must be hardened
first. Perhaps modern film emulsions are sufficiently hardened already, or
a hardening fixing bath may suffice.

Cut through the emulsion all the way to the glass near the edge with a
scalpel or razor blade. Soak in a 1% solution of hydroflouric acid that
will dissolve the glass slightly, freeing the emulsion from it. I am not
sure if this would work with plastic bases.

Another approach is to soak the negative in the following bath for at
least 1/2 hour:

Sodium carbonate, anhydrous   30 to 40 gram
Formalin                            50 ml
Glycerine                           10 ml
Water to                             1 litre

After soaking, blot of the surface without rinsing and let dry completely.
If the emulsion then does not peel off easily, place it in a 5% solution
of hydrochloric acid. The effervescence should detach it.

A final method might be to soak the negaiver for 10 to 15 minutes in a
saturated solution of potassium carbonate to which 5% of potassium
hydroxide has been dissolved. Dry the negative between blotters, polish
with a soft cloth, and cut around the part required. Lift from one corner
with a pen knife.

You might also consider starting with a film intended for stripping, if
there are any made anymore.