Perhaps it could be a way to get a firm string that is more arm friendly and with longer playability duration- the poly part could be a very soft poly that the aramid ribbon would make it firmer?
It might be possible with a hybrid poly/multi type string, but I don't see it happening with typical poly. I don't imagine the combination would provide any significant benefit compared to normal poly string in a similar price range. Of course we'd need to test it out to know for sure. Please send me a sample set when available.