Based off https://lists.nongnu.org/archive/html/sks-devel/2018-07/msg00053.html

reject-poison-keys.diff

diff -r 59f916c737be keydb.ml
--- a/keydb.ml  Tue Oct 23 00:56:31 2018 +0000
+++ b/keydb.ml  Tue Jan 22 14:09:31 2019 +0300
@@ -1166,6 +1166,12 @@
     try
       if has_hash hash then [] else
         let keyid = Fingerprint.keyid_from_key ~short:true key in
+        let keyid_long = Fingerprint.keyid_to_string ~short:false (Fingerprint.keyid_from_key ~short:false key) in
+        plerror 4 "considering keyid %s" keyid_long;
+        if List.mem keyid_long [
+          "E41ED3A107A7DBC7"; (* 2018-07-16 *)
+          "86CE877469D2EAD9"; (* 2019-01-22 *)
+        ] then [] else
         let potential_merges = List.filter ~f:(fun x -> x <> key)
                                  (get_by_short_keyid keyid)
         in