Hey, you've raised humans before, how hard can it be, right?
Would it maybe work to set up a small portion of the side of the tank with coarse netting only the fry can dart trough?
I know wrigglers can be daft. Been spending my afternoon catching the late hatchlings from my danio experiment, as the oldest ones are now chasing them full time, they have their first gold strip already and are the size of newborn platies. They do grow fast as long as I remember to bring in green water regularly. They seem to grow overnight on those days.