Biamp question

Why not. You'll just need a crossover, the amp, and some cables. I like simple systems but you have a nice combination and maybe some tube rolling and a tube amp for the top end will get you to the next level. Not a fan of bi-amping (even though I do) but this application sounds good.

I thought I could. I’m just not sure about the logistics exactly. 

It's not hard. Out of the preamp into the crossover. Out of the crossover into each amp. DBX makes a very affordable crossover. You can spend more but the DBX does the job. 

Do you need to pay attention to the crossover points or are they going to be pretty standard?

You will have to figure out where the crossover points are for your speaker. Looks like 2.8 K is where your speaker splits but double check that.  

You do not need a crossover- just let the speaker do the work.

The crossover allows you to set the crossover frequency, adjust levels, and remove the unwanted frequencies from going to each amp. It's the most flexible setup.  

And I’m pretty sure I am the most confused person in the room right now. 

I looked up your loudspeakers, they are designed to be bi-amped. Just take the strap off of the speaker terminals. They will work with or without a crossover but the proper way is with.