My very first question to you is why you want to marry this foreigner person according to religious form of marriage according to Hindu/Vedic/ Arya Samaj form & why not go through Civil form of marriage as applicable to you in India under the Special Marriage Act, 1954 where neither the religion of the party has any consequence for the solemnization of valid marriage nor this person will have to get converted to Hindu religion, get a Hindu name etc. The very fact the Civil Marriage in India under the Special Marriage Act, 1954 is duly recognized by not only India but most of the foreign countries. The Immigration departments of foreign countries & home department of India with regard to passport law/rules legally recognize the Valid Marriage Certificate you get after this marriage is solemnized by the Marriage Officer/Registrar in presence of three witnesses, & there after properly registered. The fact the Arya Samaj Mandir Marriage will first require her conversion, then the marriage & after this you get this Marriage Registered under the Hindu Marriage Act, 1955 or the Special Marriage Act, 1954 with the Registrar of Marriages of the District/State where you reside & got married. All this take so much of running around whereas the Civil Marriage under the Special Marriage Act,1954 no running around & every thing done in the same place & takes only two of your days, one for giving one month notice & second the day you get married & your marriage is registered there itself & the Marriage Certificate issued then itself. The total time you spend for the civil marriage under the Special Marriage Act, 1954 on both days is less then one hour. Rather engage a lawyer for the documentation etc & lesser time you spend for all this. As far the Marriage Certificate the Arya Samaj Mandir issue has both the names of the party who converted, so does the conversion certificate & both these certificate will be required for the Registration of the Hindu Marriage under the Hindu Marriage Act, 1955 or under the Special Marriage Act, 1954 or any local Marriage Registration Act of the State where you reside in India after which you get a Marriage Certificate under any of these Acts from the Registrar. Where as the Valid Marriage Certificate you get in the Civil Marriage under the Special Marriage Act, 1954 is good enough proof for the Valid Marriage, the Hindu Marriage will require all these certificates as named above, along with the photographs of the Hindu conversion as well marriage ceremonies etc to satisfy the Immigration department of the foreign countries. Rest is entirely you decision but what all I have told you is the best way to get married to a foreigner person in India.