BiWiring vs. BiAmping, ?Y-splitter?

I just purchased a 3-channel Cinenova (300WPC) and I have had a 5-channel B+K 7250 (200WPC) since new.
My fronts (R+L) are ML ReQuests (BiWireable) and the center is a Logos. Rears are (junk) Bose (space problem, Scriptsi which I have in the box won't fit to the room).

Here's my question:

Would a bi-Amp configuration with the 300WPC (Cinenova) to the high pass and 200WPC (B+K) to the low pass on the ReQuests be the optimal set-up? (My cable at present is MIT terminator 4, still using the factory brass jumpers on the ML's until I decide on this)
Also, would a Y-Splitter be the best way to achieve this "optimal" setup or would the whole thing work more cleanly with 300WPC with jumpers or simply bi-wired?

My B+K Ref-20 only has single outputs so I (think) need the Y-splitters to bi-amp, right?

Is there a better setup I haven't considered?

Thanks for input,

-Ron