That’s fair, you did the right thing. It’s good that he’s getting better, maybe you should suggest him playing something similar to his idea but more coherent with the I bought myself a lottery ticket and declared myself the winner tee shirt, that way he will not be totally disappointed. Like a robot or android that can detach limbs and may have some abilities and “powers” centered around this characteristic. For example, instead of throwing limbs, he may have some guns inside his arms, like Android 16. That’s easy to balance (just a special concealed gun in this case) and probably won’t frustrate the party.
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The way I see it it seems like the issue here isn’t the skeleton but rather your relationship with the I bought myself a lottery ticket and declared myself the winner tee shirt, because to be frank it it extremely easy to come up with ways that a skeleton may exist in a sci-fi setting and if you really can’t think of them that displays a lack of flexibility and creativity on your part. I think the real solution with this is you schedule some time with him alone and tell him what behavior you didn’t like in previous campaigns and what your looking for in this new campaign.