For 4 degree typing angle, The only one I can think of is the matrix 1.2og, it's pretty pricey because you can only get it aftermarket (definitely more expensive than the kfe) but I really like it and if I liked tkls I would pick one up.
In terms of a 60%, The martingale was 5 degrees and looked pretty good, I think there might be extras so if you like the design that could be an option as well.
Hope this helps