Ok.. In that case.. you can do the 20 hrs of flying.. Don't think you need 30..
For this you can go to MPFC(Indore or Bhopal) you should be done in max 1 weeks time. . and they charge you 6000-7000 per hr.. you can search the phone no.s online.
Another thing, I know a friend of mine who was in a similar situation as yours, but jet airways gave him a certificate of ground rt experience and some of them showed their supernumerary for the same, it worked for them.
Best thing to do is to visit WPC, explain the your situation and ask them for the best way to do it.
And if you are still in a rush ( I would be, If I were you :P) then just do those 20 hrs, enjoy the cessna before you jump into that right seat!
All the best!