There is a sublime3 port, but it does not start for some reason, so I tried installing the port you mentioned. That works indeed.
^R is sweet. Should suggest the Kate devs to add such.
However, sublime seems not to have split screen, a feature I cannot live without.
Regarding Kate, this is how it looks just now. When I tried it out first, I didn't think I would like it that much.
View attachment 4357
What I like with Kate too, is that it is the only editor (except of ancient Brief editor) I know of which is able to block mark, cut/copy and paste.
See the blue marked text block below the open menu. This is so convenient!