Overpowering my speakers

I have usually owned amplifier of very high power. Over driving is not an issue… you are going to hear it before you do any damage.

‘However, accidentally connecting your preamp in a way to pass full volume (record out) to your amp could damage your speakers (like unmuting with this connection). But that would be a bad thing with an underpowered amp as well.

No. If you are worried insert some pads.

Worse risk with underpowered

No such thing as too much power, too much volume is the problem. 

Unless you have issues with fine-motor control ... I would just enjoy the additions ... especially the Pass.  Nice choice ...