Do you think the meltaway is solid enough or hobby molds are flexible enough to use those thin plastic molds? Maybe if dusted with cocoa or 10x first, or popped in the freezer for 5 min?
These look like a nice one-bite size. Hmm, can I steal your idea?
and a couple more - shopping for you is far more entertaining than the work I should be doing
https://www.chocoley.com/plastic-sheet-mold-plain-heart-1-25/
https://www.chocoley.com/plastic-sheet-mold-puffed-heart/