Don't conferences already use a blind process to determine speakers?
I thought conferences typically wanted to know who was proposing talks so they could look up people's backgrounds and such. Many have speakers in mind and reach out to them, rather than waiting for proposals to come in. I don't recall seeing any that talked about blinding proposals so they could be chosen without knowledge of who was doing the proposing. I'm sure it's been done, but I don't think it's common.