In theory, adding multiple powered subs to any good quality full range speaker is one way to tackle optimizing performance in a larger room and making a "statement" accordingly, possibly even a bigger more impressive "statement" than the ones from others that you are targeting to emulate.
The thing I would question more is the planars ability to sound like conventional dynamic designs or vice versa in this case, mainly in terms of large scale mid to upper bass macro-dynamics that blend in well with the lower bass of the dynamic subs. The "statement" should still be quite impressive, but I would expect the resulting sound to be a somewhat different flavor due to the basic design and physics of planars versus dynamic speakers.
After that, what can substitute for what and how much it costs becomes more of a subjective matter of what it takes to get system A to sound like system B. At this point its no longer just about speakers, but overall system synergy and sound.
The thing I would question more is the planars ability to sound like conventional dynamic designs or vice versa in this case, mainly in terms of large scale mid to upper bass macro-dynamics that blend in well with the lower bass of the dynamic subs. The "statement" should still be quite impressive, but I would expect the resulting sound to be a somewhat different flavor due to the basic design and physics of planars versus dynamic speakers.
After that, what can substitute for what and how much it costs becomes more of a subjective matter of what it takes to get system A to sound like system B. At this point its no longer just about speakers, but overall system synergy and sound.