Good evening,
Welcome to the Hauptwerk community.
Since your console was "midified" you should be able to use Hauptwerk without problem. Many end-users have converted/midified console, many using Artisan' components.
Since your console "output" is probably using a midi connector (not a USB one), you will need a midi to usb cable, or purchase a midi interface with an onboard midi interface, or just a midi interface. The midi to usb cable will be the least expensive solution.
Once you have this cable, you may want to make sure that your conversion works correctly by testing each notes of each keyboard/pedalboard, toe studs etc. To help you read midi message on your MAC you can download MIDI MONITOR from this site https://www.snoize.com/MIDIMonitor/.
Regards
You can also download Hauptwerk User Manual (https://www.hauptwerk.com/documentation to learn more about Hauptwerk and download a copy of the trial version. Recommend that you browse thru the documentation to optimized your 14-days trial of Hauptwerk.
You will find on this forum a ton of information and great users always ready to share and help.