It sounds like the tropical sundews are about right for the height and non-dormancy requirements. Drosera spatulata, Drosera adelae, Drosera prolifera, and Drosera alicia are some of the sundews that are easy growers and about 3-4 inches in rosette or height at the most. Some of the Butterworts might be worth a try as most grow low rosettes and some, like the Mexican species, grow year round and produce beautiful flowers. Cephalotus follicularis might be worth a try even though it is considered a semi-temperate as it would enjoy the temperatures you can provide and will only rest for a short time in winder, not go completely dormant.

If you can get more space, a Nepenthes would eventually be worth a try as they are large beautiful plants, some liking a drop in night temperatures as well. Nepenthes can be slow growing, so if you get one that is only a few inches tall, it might take a couple of years to grow too large for your setup. They eventually vine out and some species have been reported growing out to 20-30 feet across the ground or up trees in the wild though you can clip and trim them, producing cuttings to make more plants.

My Nepenthes sanguinea was about 3 inches tall when I received it, producing 2 1/2 inch pitchers. Now, only 4 months later, it is still only about 4 inches tall and producing 4 inch pitchers.

Also, Terrestrial bladderworts, have flowers similar to orchids, albeit teeny tiny orchids, but I'm not familiar with their cultural requirements. And their carnivorous activity is invisible as it occurs with organisms in the soil getting sucked into a bladder.