I'm glad you asked, cuz I'm sure that your Argus would love to eat some roaches. In the case of the pic I just posted, I just threw the roach in and the baby melinus grabbed it. Given the strong feeding response of Argus monitors I don't see why that wouldn't work for you. My wife is pretty cool with my weird interests, so I really wouldn't sweat it if a hisser or 2 escaped. I don't think that would lead to an infestation.
There are many ways to feed roaches and keep them contained. Prekilling and clipping there legs are two of them. I don't really care for those and prefer to offer them in bowl with (here's the 'secret') a thinly coated ring of lard around the inside of the bowl. Every roach related website I've seen reccomends vaseline for this purpose. While I don't think vaseline is super toxic, I don't really want my animals ingesting it. I also use lard to ensure that the roaches stay in their homes.
I have colonies of hissers and lobsters. Roaches are great, they're nutricious and virtually free. I really don't know why anyone would waste their money on nasty crix.
Enjoy your roaches!
Neal
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pale reason hides the infinite from us