They now do a swivel Helinox but is a tad spendy.
Bigger packing (42x14x14 vs 35x10x12cm), heavier (1250 vs 850g), not as strong (120 vs 145kg).
I think I'll give it a miss.
I notice that Helinox are now offering ball feet for soft ground, that apparently go on over the existing feet (OOS/NYA, $30)