As many other posters have said, there is no obvious available candidate. Given the options I would, reluctantly, go for Sven on a 1 year deal, at least he has some pedigree and the experience needed that is so clearly missing. He would simply have to prove himself as not being a cheque book manager but I'm sure he could get the team playing again in a disciplined manner and offer some stability.
This isn't ideal and maybe he would rebuff such an offer but until the right man comes along something has to be done as KMac is, sadly, out of his depth..