dumbeat, I respect your choice, and I'm happy that we are chatting rather than flaming each other. Much better fun in audio forum participation! :)
Duke and I know each other; he is a respected speaker designer. He does a distributed array of subs that has met with critical acclaim called Swarm, well regarded.
No doubt doing what you plan with biamping would make a sizable difference and very likely allow you to achieve your goal, at least mostly. The question I would ask myself is, would the cost associated with doing bi-amping any given speaker be less productive than seeking a different speaker. Yes, I know, a maddeningly nebulous question without a direct answer. I'm guessing you have asked that, however.
I have Benchmark Audio AHB2 amps in Mono mode right now running a small tower with 6.5" mid/woof. Never enough power... ;)