Well, it seems like I agree with all your possible answers. :) The interpretation I intended was b).
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"For me there's no distinction between adapting an existing library and creating a new one. Perhaps the distinction is whether you try to move your patch upstream. You're trading some pain now for mitigating merging pains later. Depending on the context it might be worthwhile. However, it is valuable to think about this tradeoff rather than just flinch instinctively away from making changes to any libraries and try to patch them from the outside."
When you say it like that, it seems we're part of the same club after all. Glad to join you. ^^
