I suppose so, conventionally the lenticular effect is only on a single axis.
Not sure about specialty resins, any UV will will destroy polymer chains and they all usually have inhibitors. Fused silica/quartz is the better choice.
You may also want to look at reverse or solar fresnel, not sure if they make one that small in glass though. Although I think anything infront of the chip will just reduce output too much relatively.
The smaller chip looks ideal, good luck.