Dennis Wong's site is an excellent resource for all thing planted tank.Here's his article on how to grow low tech carpets:Are there any carpeting plants that can be grown in low lighting and grow well in Eco Complete with good fertilizer?
I have a low to moderate lighted tank, more on the lower side though. I understand that there are a lot of plants like these that need moderate to bright or bright to very bright.
But you're right that traditional carpeting plants need lots of light. Some my survive on less, but they won't stay short & compact. No experience with either myself, but a mat of java moss, or susswasstertang might work for you in low light. Perhaps others can weigh in on their experience with those
Will be interested to see what you end up trying, and how it works for you