Yeah, I get that. If you like the anti-caster idea then maybe something like foes having disadvantage to maintain concentration from attacks.

Or like you said, something like the Lizardfolk’s racial ability might be a good template.,

As part of a short rest, you can [use materials] to create [a thing]. To use this trait, you need [tools]

So something like “as part of a rest you can use Bang Snaps to create an explosive tip for your whip.” (I wouldn’t say it needs any specific tools.)