It's a real dangerous idea. If you talk to feds without a lawyer, they can prosecute you for
'lying' on the basis of their testimony about what you said. Of course, they will record the conversation, but if you don't incriminate yourself they can just delete the recording and say you said something other than you did.
You need to have a lawyer. If you honestly don't really care about spending years in prison, at least surreptitiously record the conversation yourself and make sure that recording is sent to others who can retain it if they do arrest you and seize your devices.