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Now that you and I are on the same page, it would take a good premium over face for me to bother taking my time separating the "brick" of postage the OP has. Dump them all in a bowl, allow to soak apart, gum be damned, dry, then use (glue stick) or sell as ungummed discount postage. They also can be sold as discount postage in the form of the brick.
Yes, that is my preferred route as well.
In my early years, spent valuable time, trying to preserve stamps in their best possible station, but it was folly.
All my sweated stamps, Malay definitives, with huge globules of yellowing gum
they never really survived in a state, that encouraged repeating.
Yes, save the mint full gum in mounts, including the "lightly hinged" (a quarter perhaps, remaining of the lip of the hinge) the rest soaked clear of mucilage, and just bite the bullet.
As I advertise for "the ripped and torn" and "abused" stamps in my swaps,
I often get stuck blocks, it may feel like scraping your nails across a blackboard, but I just dunk, separate, and joy in the clean, flat, examples,
that slide off the freezer bag.