This thread is a little old, but I feel that it very well can be complemented by the mention of the UHK. It is a 60% split mechanical keyboard and has the killer feature of an awesome open source configuration tool called agent. It is built by a small company in Budapest. Right now my order is pending, since they worked on the keyboards second version this last year and got delayed due to covid issues I guess*. Gladly I will give an update as soon as I actually have that thing under my fingertips.
*frankly the wait has been frustrating, since shipment got delayed time and time again. But all signs point twoards a product of very high builtquality, so hopefully it will have been worth the while.