How about Pink Tongued Skinks? The one that I worked with ate snails and slugs, as well as worms. Humidity would not be a problem if you spray the tank and partially cover the screen lid.
There are other lizards that fall into your parameters but not too many. Unfortunately the majority of them would outgrow the enclosure you describe in a year or two, if not sooner.
The real question here is, does your girlfriend hate all insects? or just crickets? If it is just crickets you have no worries. There are people who never feed crickets to their insectivorus animals. Other options include (but are not limited to); mealworms, superworms, waxworms, butterworms, silkworms, and cockroaches. All of which are easily available in this country. I've also heard rumors of grasshoppers and wingless house flies on the market. And this does not include insects that you can catch during the spring/summer/fall.
If she hates all insects you are really limited, mostly by the dimensions of your cage. To be honest, most of the smaller lizard species being bred and sold in this country eat bugs. Those that don't eat bugs can be hard to find and expensive.
Hope this helped,
Jason Wakelin
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