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Just blue sky thinking, but could the plaster be waxed first, and then a release agent used, before using it as a mold for resin?
Is oil-based clay that molding clay that is very stiff and never dries? Could you have made the entire mold out of molding clay?
I'm new to this. Would it be possible to put a little curing agent on the sticky resin to make it cure and stop being sticky?
1/8 cup = 2 Tbs
Brilliant! I've seen smaller rice paper lamps in the Japanese dollar stores, like Daiso--I know smaller would be less effective, but in the interests of packability, I wonder if they'd be good enough.
If you're at a bar, you could order one of those drinks that come with a little parasol (umbrella) and use that, if you can figure out how to make it stay on or if you have washi tape in your EDC (everyday carry).