It sure would be interesting to find out what kind of trike this is. Doesn't sound like one of the typical commercial offerings. Was it intended to have an e-assist (electric motor) as well? I don't think anything can be done to make this drivetrain practical. A 30" 1st gear is still way too high IMO. If brought down to something better like ~15" then the high gear will really suffer. More speeds like the earlier poster suggested ... absolutely. But how to get them? If we knew more about the trike it might guide our thinking. I mean ... the mid-drive might be a good place to put another freewheel and get more gears. Or not. Without seeing the trike we can't say. A triple crankset might be another but it might present too much of a torque load to the IGH (rear hub). TL;DR more information is still needed on this trike.