Marrying a foreigner in India

Hello everyone, i need some advice, kindly help me with it . I am an Indian muslim, and i want to marry a girl who is from Iran(shes muslim too), she stays in UK now since shes pursuing her education there. We want to get married, but she doesnt wants to go to Iran and get married there probably because some of her family issues, so if shes in india on a tourist visa, 1) how can i get married to her in india? 2) how many days will it take to register our marriage? 3) can she stay in india after 60 days of her visa expiry after our marriage ? 4) does she need any NOC from Iran embassy?(what if they dont give)( we can get a affidavit done by the magistrate?)5) after registering with the SMA , they sends a notice to both the parties in the span of 30 days? what if her parents gets the notice and objects to our marriage ? moreova i came across this article its say - Any foreign national in the national Capital can now marry an Indian even if he or she has not been provided with the prescribed ‘No Objection Certificate’ by their Embassy about their marital status. A circular to this effect issued by Delhi Government Deputy Commissioner Juhi Mukherjee has given the relaxation with some riders to ease marriage process of Indians with foreign nationals in the country(2016)( link - https://www.dailypioneer.com/2016/page1/embassys-noc-not-a-must-for-foreigners-to-wed-indians.html) apart from special marriage act, i can marry her under muslim sharia law ? too since we both are muslims(shes from Iran).( or we need to marry under both the above and have 2 certificates of our marriage- one from the muslim sharia law and other one from the special marriage act ) she easily gets a 60 days indian e-visa and can get married here in india within that 60 days, later we can extend her tourist visa to short visit visa or Xvisa through the FRRO with the proof of our marriage certificate or should i apply for her extension before the marriage through my invitation letter or personal undertaking? so she doesnt needs to leave the country . *After the marriage is done, she can stay in India and her Visa can be extended(on the basis of our marriage certificate) so she doesnt needs to leave the country. I cant risk her going back to iran after the marriage, because her parents may not agree for our marriage and may not even let her come back to India