Honestly, what you're looking for is: Out Of Your Head by Fongaudio
https://fongaudio.com/out-of-your-head-software/
It is the closest you're going to get to a Smyth Realiser in an affordable, portable software version. Give your ears/mind some time to adjust and try different presets. The results are stunning. I just tried Rappr... It's another novel attempt at artificially recreating a speaker-like sound, and like all the others, it sounds like it, i.e., artificial.
What set the Realiser apart is that it used convolution technology to capture the way sound travels through real speakers in an real room to real ears, and it sounds like it, i.e., real. OOYH uses the same technology but in a software deployment, saving the costs of high grade component converters, amps, etc.
I should mention that OOYH is--much--more expensive than Rappr. But, once again, it sounds like it.
All the best to you.