I dont think you should approach this any differntly then if the first day was live and you made day 2 with 527k.  The multiple flights happens all the time in live tourneys(see WSOP ME), the emrging of stacks is nto really a factor once you make day 2, the EV of the decision to paly multiple days is something that is interesting and done during the WSOP Asia-Pacific in Austrailia.  They had a tourney called the ACcumulator, with multiple starting days and allowed you to paly as many as you wnat nd merge your stacks.  It would reQuire some broad assumptions and brunt force work to calculate EV deciisons on entering multiple days once you have made it to the end of a certain day(at a certain point the value you gain from re-entering is probably overshadowed if you have enough chips).

But once you get to day 2 all that is moot.  It will play as a regular live MTT.  Since you are likely one of the CLers and probably the Cler at your table, I would come out the gate with an agressive strategy while you figure your table out(they will be forced to be nitty while they figure the table out).  The rest is just adjustments to your table and your reads.