Hello from another leftie who has never heard of left handed knives. I just went to get my lovely little serrated knife from the drawer to tell you the type I use and have remembered that I always cut with my right hand but I see what you mean – the blade definitely has a front and a back (it is a Kuhn Rikon – I love it). To level my cakes I do as Calli does and use a wire – one of my best cake tools ever! So, sorry I haven’t been much help to you but it’s nice to say hello anyway :-)
Julia Hardy