I was never a big PSK31 user, but AirLink Express was the best of the bunch for the mode.
I don't know enough about programming, but if the FT modes could be added, and somehow simplified/streamlined - again not sure if it's even possible - it would make AirLink Express an option for the FT modes.
I'm always reminded of the great work W4CQZ did to introduce hams to JT65, with his streamlined JT65-HF. This was before WSJT-X was released, there was only WSJT at the time.