Hi TheCount,
I have a similar problem with Kikuyu in my Couch. I use undiluted Glyphosate and a small paintbrush, and paint it whenever I see it. I've found pulling it out by hand may not get everything, and leaves the chance of regrowth. You obviously need to be super careful not to spill any or paint anything you don't want killed. I would also recommend good gloves as we all know how nasty Glypho is supposed to be nowadays. I couldn't confirm what the grass type is either. Another option would be to try a herbicide that isn't safe for Buffalo but is for couch. Some wintergrass killers i believe may do this, but you would have to check the product label. Some of these may kill Buffalo, and will knock back Kikuyu but not completely kill it. Just be sure to double check any herbicide labels if you choose to use one. The undiluted Glypho is a choice I make knowing the associated risks. I wouldn't want you to do any serious damage to your self or lawn.
Cheers,
John
