A lot of people I've talked to have had longevity problems with invert feeding snakes. I think that the cup idea is good, but I would try to only put as many crickets in as the snakes could consume in a feeding.
Crickets should be gutloaded (fish flakes or crushed high quality dog or cat food make good staples, along with orange slices and carrots for water) for at least an hour before they're offered. They should then be dusted with a high quality calcium and vitamin supplement, I use rep-cal with vit d3 and herptivite for my shovelnose. The dusting tends to decrease the longevity of the crickets and also gets groomed off and falls off them, this is why I would only try to feed as many as they can eat in a sitting.
Some people have also reported that UV lighting is important for these snakes along with lots of vegetative cover; I imagine either fake or real plants would work equally well.
I haven't kept these guys, but I do have a mojave shovelnose that I've had for over a year and a half now and the above mentioned cricket regime seems to be keeping him healthy.
-Alice