A Dutch seller of old whetstones sent me a list of suitable whetstones for razors. 3 of them are pictured below. The left 2 Franz Swaty,Wahring bei Wien 8 x 2" and 5 1/8 x 2". The right is marked Barber's razor hone 5 5/16 x 1 6/8" €7,00 ($9.6) each :hmmm:
I saw a member rate the swaties at 8-10k so that would make a perfect bridge between the Rozsutek and the Chinese stone :)