We need a rich billionaire to offer a million each to any survivor who comes foreword. They really can’t be intimidated after what they went through unless they’re cowards.
That would be spun as suborning perjury. I would rather they be subpoenaed and, if they don't show, the House can issues warrants and send the Sergeant-at-Arms to arrest them and compel their appearance.
Parenthetically, this is insane that we've arrived at the point in this country where these discussions are needed.