To know if there's a suitable motor, we'd need to know how you define that.
For instance, what job (speed, acceleration, range, etc) do you need the system to do for you, under what riding conditions (terrain, winds, road type, total weight, etc)? Defining those you can then use calculators / simulators like those at ebikes.ca to find out the power (and capacity, for range) needed to do those things. Knowing that you can then figure out what motor might handle that power, that is also capable of the speed you need at the same time.
I'd bet taht QSmotor makes one that can be used, though might need some adaptation.
Probably not what y ou are after, but there are some "wheelbarrow" motors out there that might work if you don't need much speed or power, but might require a new axle to fit the dropouts, and possibly bolt-on flange adapters.