I just finished making a “Left handed” chanter with wooden head and stop key. The fellow wanted the keys ( other than the C key) mounted on the other side of the chanter which I did. To be honest, I realized that I could just a easily learn to play the chanter right handed even though the keys were in a different position.
In my opinion a left handed chanter is like a left handed baseball bat.
Regulators and bag placement are a different matter.
In terms of Irish music, keys are not a necessity. 99% of all tunes can be played on a keyless chanter. The value of keys is more for looks than anything else. The C, F natural, G# all can be fingered by half holing, no keys necessary
All the best,
Pat Sky