Knives likes that usually have a second bevel grind i. e. the shiny part of the blade has a slightly bigger angle than the coated part. That kind of grind is fairly easy to maintain, if you have some pratice. It also allows to sharpen the knife without taking the coating off.
I use a Fallkniven DC4 for maintaining my blades. It´s small enough for carrying.
Sharpening a knife is an aquired skill. If you have not done it already, you might want to find someone to show you how to do it and get some pratice with it.
I do not know whether the RSK MK 2 has a 90° spine. However at 57 HRC you could just use the cutting edge close to the handle for scraping the ferro rod without too much fear of damage. That will allow you to hold the knife the way it was designed - which may be safer anyway.