It shouldn't be a problem to move them to a new tank, but you need to know their molting schedule, you want them both to be moved (since the night of the molt is also the fertilization of the next set of eggs), and it contributes nutrients and potentially problematic spores to the rearing vessel (like hydroids). Without predators, blacked out sides and a dim light up top should allow you to collect the larvae in a display or broodstock tank, even manually, over the course of an hour or two if needed - they can swim for at least a few hours without issue so long as flow/getting tangled in things isn't a problem.
The actual amount even hundreds of larvae will eat is on the order of a couple dozen nauplii an hour, so unless you're diluting your feeding solution, it would be difficult to continuously drip them in slow enough to only be what they consume.
As for their commercial availability, Live Aquaria has had them in the last few years that are captive bred, I believe in conjunction with a university lab that's actually doing the settling, but then selling through them. That suggests to me that the effort required/settling rates are high enough/low enough respectively that they're not truly commercially viable at the moment. Also I'm hesitant to recommend live aquaria as their shipping quality seems to be extremely lax as of late (I do hope they fix it, but I won't be buying from them for some time yet.)
The actual amount even hundreds of larvae will eat is on the order of a couple dozen nauplii an hour, so unless you're diluting your feeding solution, it would be difficult to continuously drip them in slow enough to only be what they consume.
As for their commercial availability, Live Aquaria has had them in the last few years that are captive bred, I believe in conjunction with a university lab that's actually doing the settling, but then selling through them. That suggests to me that the effort required/settling rates are high enough/low enough respectively that they're not truly commercially viable at the moment. Also I'm hesitant to recommend live aquaria as their shipping quality seems to be extremely lax as of late (I do hope they fix it, but I won't be buying from them for some time yet.)