Yes, I contacted light bicycle as well, and they will also do DT Swiss 240s with 28h options. I suspect 28h systems will continue to decrease in popularity since straight pull vs j bend and boost vs non-boost has bifurcated the market.
I ended up going with a 24h/24h carbon wheel that is relatively deep + wide, with the rationale that such a rim in practice is going to be much stiffer and stronger than rims that were popular when higher spoke counts were the norm. Still doesn't help when you need to limp onwards after breaking a spoke, but maybe it's just time to start carrying around fiberfixes. For context, I have a Salsa Cutthroat for truly multi-day unsupported bikepacking, which accepts MTB (boost) wheels, so the intent with this wheelset + bike is to have a more rugged bike for travel/winter/daily gravel, but generally not be out of reach of civilization.