More bad news, lost both of my female GBR to wounds, one had a part of her lip bitten off and the other had the wound on her side. So that's not brilliant.
The two males appear to have a truce mostly with the tank almost divided in two between them. One is more dominant over the other though but the tank is big enough and planted enough that they mostly keep out of each others way. We'll see how it goes.
I have two baby angelfish in there now as well. I know they might not get along as they grow up but they're fine for now. I went to the LFS to see if they had good looking healthy female GBR to add in but they only had small and thin ones so I didn't feel confident to get any of those. I however succumbed to the angelfish.
I should probably have thought it through a bit more but watching them makes me smile so that's something.