The programmable mechanical keyboards are going that way. Some of the newer ones can trace their lineage pretty directly to Arduino clones running TMK/QMK firm

The programmable mechanical keyboards are going that way. Some of the newer ones can trace their lineage pretty directly to Arduino clones running TMK/QMK firmwares. The commercial version is usually going to cut out as much of the Arduino bits as possible and go for a soldered on microcontroller once you're building for sale.