Well, federationism implies the equality of federation members. The whole issue here is that all the Poland-centered federations, whether their proponents proclaimed prometheist ideas or were blunt about subduing the neighbours, were in fact either Polish-dominated, or such a domination was implied, even if subconsciously.  

 On the side note: my personal opinion is that the main reasons of PLC's demise was the lack of equality to non-Poles. Be it the Ruthenian or Lithuanian nobility, which had to get polonized in order to achieve politically, or commoners, who felt like relying on violent cossacks was the only option to have their religion protected, since their native protectors abandoned them by getting polonized. But this is just me.  

 If expansionism since too inflammatory, let's think about other names.