Im hindu she is muslim we want to marry

The case is simple .... im hindu and she is muslim ... we love each other and we are planning to marry in next 5 yrs exactly .. so we are pretty sure that our both families will never accept our relationship ... being a middle class family we planned something different ... I had planned to write a bond stating that i will marry her in next 5 years if that is not happen .. condition is " i will pay her 20 lakhs and if i did not pay her ... she can proceed legal issues on me " The same thing she does ... i mean she will also write a bond stating that if i did not marry him .. i wil agree him to pay 20 lakhs as per the bond statement ... this bond is valid for 100 years .. no family wants to pay 20 lakhs for the bride or groom which their really do not like .. .. so they dont have any option rather than marrying us ... can any one please let me know the bond sample .. there should be no loop holes in the agreement even if it goes into the court steps.. Is one 100rs stamp bond paper is enough for us to write this dual agreement ? how many witness signatures is required to this ? Any attestations of the lawyer in it ? Do i have to renew it for every year ? kindly let me know the complete procedure i do not have any idea on this ...