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You could also use rigid nesting containers and put the pulp in between them and apply the pressure. Perhaps metal measuring cups would work, although you would need to also seal the gap between the containers to prevent the pulp from oozing out. You may not need to compress it too much for seedling pots.
For paper mache, my mother made a paste from water and flour that was simmered on the stove. It should work for this application, but I have no idea how it would compare with the corn starch or rice flour used in the original experiment. If you are going to heat the mixture, mix the flour with cold water until smooth, then stir while heating. This is basically an unflavored gravy and will thicken the longer it simmers. To simmer, heat until the mixture begins to boil, then lower heat so it very slowly boils - a bubble or two every second or so.
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