If you go for non-UST Kenda's, get an SWS version. They have a tape added around the sidewall to reduce cuts (a real pain for tubeless, as the sealant struggles to re-seal sidewall cuts and can force you to fit a tube or scrap an otherwise good tyre). Nevegal SWS have worked fine for over a year on my Stan's rims without the weight penalty of UST or LUST (or any flat tyres in all that time).
I think I read about non-UST Kenda's being difficult to seal due to relatively porous sidewalls, but I've had no problems. I think the SWS strips helped here: when I first installed them air leaked (a tiny bit) around the edges of the strip but not through it. You can still find Nevegals etc with SWS online.