Honestly, doing this for would be such a hilarious operational vulnerability that I think it would be like a dinner bell ringing to th international spy community lol.
If they release files with only Republican names blocked out, all it'll take is a single congressperson to read the full list of names that appear in the documents out loud during a speech and into the public record — then, Internet sleuths and journalists will be able to piece together names from details, they always do.
White People: "guns are for everyone! That's why there is a second amendment. SHALL NOT BE INFRINGED."
Black Panthers: "oh ok carries unloaded guns'
White People: "wait actually now there are limits"