That would likely be fine. I still wouldn't do it, personally. I don't find mixing cichlids from different continents to be a rewarding experience. I've done what you're contemplating in the past but I found that a lack of variety is more than made up for by interesting behaviour. There's not much interesting about a lone Krib (of either sex), in my opinion. They tend to be pretty shy, reclusive and skittish creatures when kept on their own (i.e. without another Krib). I doubt there would be much interaction between a single Krib and any of its tankmates. If you just really want to do it, you should go for it and see what you think.