Forget AI; our RailFans are endowed with NI - Natural Intelligence

hi, i need to be in goa by 15th june morning , preferably before 4am.
at the moment i have a ticket via TVM rajdhani, boarding from kannur, waiting list 2 first ac.
my query is : would it be ok if i get a general ticket on the 14th of june, via tirunelveli hapa sf express that reaches goa by 1:45 ish in the morning on 15th... meet up with the TTE on board and ask for an upgrade to sleeper or any other available class?
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dont know what are my odds of finding a place to sit from CAN to MAO considering all the reservations are full as of today!
what are the chances of me getting a seat in the hapa express. on 14th june if i ask the tte? i just want to sit dont need a bed/birth any class doesnt matter.. if my chances are good, ill cancel the rajdhani wl2 for 15th morning(i dont prefer this train as it arrives at 11ish at goa but im afraid i have no other choice!?)
looking forward to your opinions, ps excellent work with this forum keep it up!!!