rationalfrummie,
The issue with Get is when the social and economic pressure begins before the Bais Din issues a seruv.
mdd,
According to many (most?) poskim, in evaluating geirus, what the convert does after the conversion is not relevant. What is important is whether there was kabolas mitzvos at the time of the geirus. Because devarim sh’b’lev aynam devarim, if there was a verbal kabala of the ol mitzvos then the conversion will be valid (assuming proper mila and tevila) unless it was clear (umdina d’muchach) AT THAT MOMENT IN TIME that the kabala was insincere.
Post conversion actions cannot retroactively annul a geirus.