Yeah, the taste part is really cool for this genus, but sadly this will probably not end well if we attempt to use it for any other mushroom genus.
Yes, there are some good russulas with a red cap. Just do the taste test to determine which ones are R. emitica, because that one will definitely ruin a whole dish if mixed with other mushrooms.
I read something recently where people were using the R. emitica as chili powder, because it is so peppery. I am going to have to do more research on that, lol.
Oh, that is really cool. I have never heard of that before, but that is definitely something I would like to research and possibly try.
I bet the Nordic Food Lab folks would help you test that! They are in Denmark, I think. They try things, lol.