Going from a T-41 to a C-172 shouldn't be hard at all. Although I've never flown the T-41, I had to switch from a C172 to a Piper Tomahawk, which was a much bigger adjustment (totally different plane). Most of the extra hours I spent on my PPL were still just procedural things, i.e. re-soloing in the Tomahawk and taking care of all the things IFS doesn't cover (short/soft fields, night flight, more hood time). So IMHO, go for it!