lack of tagim of Rabeinu Tam
In the Yud of the word "Hashamayim" it does not have the Tag of Rabeinu Tam (actually most of the yudim do not have tagim on them). The fellow that gave me this mezuza to have it check is Ashkenazic background but not so observant and definitely does not have mehudar Mezuzas and tefillin (we call this "mivtzaim mezuzas"). He does not keep all ashkenaz customs (does not daven Nusach ashkenaz). So my question is as follows- does the din of "Kotzei derebeinu tam Meakev for an Ashkenazi" apply even to those who are not so frum or do they need to follow ashkenaz customs for us to apply the din. Obviously my question is if one can be lenient and machshir a mezuza when every or most of the yuds (of a basic sephardi mezuza) is missing kotzim derebeinu tam). The poskim do machshir all types of Ktav as the Mishnas Hasofer explains in his intro to Smin 5 (however is it also speaking about a ktav velish which is missing kotzim drebeinu tam?) I appreciate your input.