My know. But my intent is to only say the PS90 is semiauto only no matter the generation of the trigger pack.
I don't mean to say anything more or imply anything more.
OP, I just did a quick check online for the safety switches and only the FNH OEM P90 three position switch is there.
From this, I sm hazarding to say the $100 option is the only option.
Three position switch + your Gen 3 pack = semiauto only on both firing positions.