There are model tags for merged/mixed models such as berry mix. Here are some thoughts on what could be done with these tags:
Should there be implications for these models? So for example berry mix implicating novelai + stable diffusion + zeipher f222 + r34 e4 and as another example to emphasize my point, anysmirk hentai scene mix would implicate anything (model) + smirkingface_(model) + stable diffusion + zeipher f222 + r34 e4.
Another option would be to have only the model mix tag in the posts. So for example, if a post has used berry mix, it should not any of the models mentioned above beside it.
Also, I don't know enough about the terminology or technicality of these *mix models. So another question is, should mix tags be tagged with merged model or not?