I know it can and has been done for some time in other chassis but I don’t think it is being done with an actual TSX ecu as a base.
From what I’ve read the TSX ecu controls more than just the basic engine functions in the TSX chassis. Check the hondata site, only a reflash is offered for the TSX, no k-pro listed. Also, the 05/06 RSX’s are not K-pro compatible either, as is the new SI’s. Throttle-by-wire as well as new approaches to engine management seem to be holding up the development for those applications.
Just something to think about if planning to potentially mod the new sedan.