I looked up ZECHER in the Even Shoshan Concordance - and in it I located 2 occurences of Zecher - and BOTH were proper names!
Zecher is clearly wrong. Rav Mordechai Breuer OBM has confirmed this with unassailable research While the Ma'seh Rav attests to this idea of Zecher Rav Haim Volozhiner protested this very attestation [albeit very politely]. In NO way were TWO readings ever suggested
But if safeik D'd'oraiito lehumra re: Zachor why not go all the way? [Reductio ad absurdum indeed- after all it is read around Purim time! So why not
- Read it from BOTH a Sepyhardic and Ashkenaic Torah...
- Read BOTH Scrolls with every permutation of pronunciation [e.g. litvisher, Hungarian, Yekkish, Sephardic Yemineite etc. etc.]?
The Vilna Gaon himself made fun of multiple pairs of Tefillin as ludicrous and came up with 32-64 possible permutations. Ironically we are beginning to perpetuate such a practice in his honor. [Incidentally, this proves there MUST be a God or else it would make no sense to practice such a minhag to honor the one who felt such permutation as unnecessary.]
One Rabbi insisted that whilst reading Ki Tetze both Zeicher and Zecher must be read TWICE, one for Shevii'i and once for Maftir! His argument? since we have changed the form [tzura] for Zachor therefore THAT becomes THE normative way to read it EVERY time we read the Torah, including Ki Tetze! No I am not kidding, I had a bar mitzva student who HAD to do it this way!
Kol Tuv / Best Regards,