I'm afraid to try keywell keyboards since that would drastically limit layout options. For a split column-stagger kb I can just order a PCB, MCUs, switches, ke

I'm afraid to try keywell keyboards since that would drastically limit layout options. For a split column-stagger kb I can just order a PCB, MCUs, switches, keycaps and after minor soldering it's ready to go. With concave boards you need a case of non-trivial design.