EQ is a fine thing, but a lot of what makes those microphones sound the way they do has to do with nonlinearity and not something that you can change with EQ.

Also, EQ after the fact will change the response both on and off-axis, while many of those microphones have very different response off-axis and on-axis and that can be a big part of their sound.

Don't be afraid to use EQ, but it's not a magic tool that can make anything sound like anything else.
--scott