I've forked and modified this for future use. I've added a Lua script for my keyboards and some examples within it. For real use, it'd need to be modified.

COMPLETE INSTRUCTIONS: https://medium.com/@vazquezrius.miquel/secondkeyboard-1c39e52e023b In short, run set_up.bat (when prompted, accept admin permission and install AutoHotkey in "C:\Program Files"), and then edit the scripts of LuaMacros and AutoHotKey without modifing their file name. They can be found inside LuaMacros and AutoHotkeyPortable folders.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

This is a solution developed by Miquel ViR (consider supporting here: https://www.paypal.me/miquelvir).