All players are created equal and each should be treated fairly by FDev. And so, I offer my proposal and justification below.
It is completely logical that Power Play should be an Open Only activity. It never should have been accessible to other modes, as its focus is entirely PvP.
It follows that any modules gained through Power Play should also only be available in Open, as those modules were intended to be used for Power Play activities (otherwise, why would they only be available to PP players?).
So, I propose that ships with Power Play modules equipped cannot be used in any mode other than Open. To play in another mode, the player would have to unequip PP modules before they could play in PG/Solo.
It is completely logical that Power Play should be an Open Only activity. It never should have been accessible to other modes, as its focus is entirely PvP.
It follows that any modules gained through Power Play should also only be available in Open, as those modules were intended to be used for Power Play activities (otherwise, why would they only be available to PP players?).
So, I propose that ships with Power Play modules equipped cannot be used in any mode other than Open. To play in another mode, the player would have to unequip PP modules before they could play in PG/Solo.