This will be interesting to see the results. I had wanted to try TMCC outside on my G scale. I had heard some results that scared me away from trying it. I think a trackside overhead wire might have been the answer. I would have disguised it on telephone poles.
I did try it on my basement 2 rail O scale layout. The signal was very strong I believe. I just have a lack of equipment to justify using it. I may try an overhead wire there too, to see if it keeps the DCS signal stronger. It may just have been the missing choke thing.
I still need to study TMCC/Legacy more down the road. For now, I use it on a separate track to make it easy.