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If you're just looking at attaching a plastic component to another plastic component, and the surfaces are relatively flat/ fit together relatively well (a file or a hobby knife can improve this), then plastic glue will work fine. If the join point is too small/ not flat enough, then you can just drill a small hole in each component and attach them via some wire before gluing. You could then add the green stuff at the end if the joint is messy.

If they don't fit together well and you don't have a hand drill, then what you suggested could work, although you might be over-complicating things a little bit. Not quite sure if the cup is to function as part of the synthetic or whether you wanted it to look like part of the pants, but you could even just place a blob of green stuff on one of the components, smoosh them together, take one away, smooth out the green stuff then let it dry and glue.

Ultimately, it's your model, so just go wild and experiment. If it end up messy, you can always just cut some it back/ pull it apart and try again. The things I mentioned above are just methods which I prefer to use, they may not work for you. 'Kit-bashing' is not and never has been an exact science, and I personally find that most of the fun comes from trying new things, so by all means give that a go. I'm loving the idea, and I'm super keen to see a photo at the end!