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The best I can think of is a makeshift old redstone block where each state is its own separate block. Overriding the `Block::isIn` function is pointless since it doesn't take in a blockstate. This just leaves `CampfireBlock::func_226915_i_`, however this can't event be accessed since its specific for SOUL_CAMPFIRE. If you wanted to do a combined implementation, then you would need to override `Block::isIn` to return true if a SOUL_CAMPIRE is passed in and have your block extend CampireBlock. From there, you would need to put it in BlockTags::field_232882_ax_ which is also known as campfires. You could then override all the methods to make your block act the way its supposed to. That's the only two options I can really think of in the current state.

Please try deleting the fml.toml config file, it seems that it is incomplete that the config reader cannot parse it correctly.

Append to BlockTags::field_232865_O_ also known as piglin_repellents.

Why are you making a coremod? Also, as dies mentioned we target srg names as they are a stable target, where Notch names {obfed} and MCP names {community 'readable' names} are volatile and change often.