I've never heard of a glass milk bottle...
Would a medicine dropper work to catch the shrimp? How tightly do they cluster around light? My idea would be using a medicine dropper to suck the shrimp up, and then squirting them onto the brine shrimp net, coffee filter, whatever it is.
Also, do you think a few apistos like cacautoides would harm the montys? Most likely choice would be the cockatoo as others should have soft water. Perhaps they will make use of the bigger scuds.
Now that I think of it, I remember seeing a female heterandria formosa snatch a medium sized scud and gulp it down. Dunno how she managed though!