I'm not aware of a fish that will eat a Kenya Tree or any of its loose children. Xenia there are a few but Kenya Tree's we are not so lucky. Also as already noted while you can manually remove you have to be careful because the base that is left behind on the rock will grow back. Similar to other soft corals. I understand you are not able to reach some areas of the tank, unfortunately I know this all to well myself after having my hip replaced in February and a 30" tall / deep tank, what about friends or family? I have found the best way to do this is:
1. Long Forceps (heavy duty)
2. Shoulder length gloves
3. Ladder
4. Cup of water
5. Mask
6. Reach in while safely on ladder, clamp forceps as close to the rock as possible. Curved bottom forceps work best
7. Gently pull to the left or right to peel off the piece of Kenya Tree for removal
8. Left out slowly, dip in cup of water, release
9. Repeat for about 20 minutes
10. Play a bit of music or go outside and kick a bush - either works
11. Come back later and apply reef safe epoxy over area you pulled. Just remember to make it such that you can pull that off after a couple weeks
I do this with Xenia. I've done this with GHA. Slow process but it works. The other option is to counter it with another coral that stings. Some Gorgonian's come to mind that could help counter it. Picking up the floaters is another. Shading light to that area also works. DO NOT INCREASE FLOW - that will just blow them around and make matters worse.
Last resort is this - grow them. Get them super healthy so that they have a thicker stock. Then you can pull them off easier. I don't think I really have an answer for you. I apologize. It can be a pretty coral. I'm a softie person so have it in my tank. However, it seems to be kept in check. My issue is the rose bubble tip anemones that are starting to sting the few sps corals I have that are starting to mature
Hope you have an amazing day. Stay safe!