Fr. Kramer needs to read up on Sedeprivationism ... as it should solve his problem for him. Of course he lacks the authority to make any declaration of schism or to impose his view on consciences. But without the proper constrains placed upon the ipso facto mentality, whereby Fr. Cekada's "Aunt Helen" can wake up one morning and decided that the See is vacant upon finding heresy in the pope's teaching, it reduces to absurdity, and the chaos in the Church that John of St. Thomas warned about. I woke up to this problem with SVism when a man I knew declared Pius IX to be a non-pope (based on his distortion of his teaching), and there are others out there who hold Pius XI, Pius XII, and even St. Pius X to have been non-popes ... a problem that I termed "Pope-Sifting". Sedeprivationism (or Chazal-ism) provides the proper balance between ipso facto deposition by God and the place for the Church's authority to vacate the office (or designation to office). It's the only viable theological solution.
I had been with then-Father Sanborn for some time, but then ran into the wall of this problem, at which point I wrote (an an informal e-mail to a friend that somehow got published in The Angelus) "Pope-Sifiting: Difficulties with Sedevacantism". I didn't have a solution yet for this problem. Strangely, eventually both Father, then-Bishop, Sanborn and I ended up in the same place (following much different routes), at sedeprivationism.