After thinking seriously about the problems of no OVF on the K01,I checked out the OVFs on ebay,man, they make good money, a few years ago nobody wanted them,but with the mirror-less onset they are like gold-dust! also you need one for every focal length, so with cheap hoodmans available on ebay, I purchased one of those.
I fly medium-sized model airplanes and following these round the sky is almost impossible with the screen with or without the hoodman,so I made a wire frame-finder out of an old flashgun hotshoe and a stainless steel welding rod 1.2mm (defluxed) as shown in the (poor quality) photo. Used with the FA 50mm 1.4 it gives accurate enough framing with totally clear vision to what's going on "outside and inside" the frame! something which no-other viewfinder can do.Cost, the price of a dead flashgun and one welding rod.