First off, that driver is 4 ohms, so it would not work. You would have to use the 15WU/8741T-00 which is the 8 ohm version.
The XMAX is about the same as the Seas drivers, so power handling would be about the same.
The Illuminator drivers are slightly less sensitive. So you would end up with a speaker in the 86 - 87db sensitivity range.
Without modeling the driver, there is no way to be certain it is a good candidate for a transmission line design. The QTS is borderline for this type of design, so we would have to model it to make certain it would work.
Finally, Illuminator drivers are expensive. So this would add a premium of about $1000 or slightly more to the cost of a pair of Supercharged SongTowers, putting them at about the same price as the Veracity HT2-TL's.
All that said, it would probably be a wonderful speaker should someone want a pair.