You can use an AC Commander and keep the Pulmor. It might fit in the engine. If not there should be room in the tender for the AC Commander and Railsounds.
If it was mine that would be as far as I would go. Given the plethora of Hudsons if I wanted a nice TMCC one I would just get a K-Line Hudson and add a Cruise M or a PS1 MTH Hudson and add TMCC. The PS1 Hudson was MTH's answer to the 700E remake.
Pete