Just a thought even if the DADGAD idea is the simplest it would also mean that if a G tuning was used the same cords patterns played steps up and down make it a two Tuning can be developed in one.

That said I have a friend who is a Vet! He is also Left Handed however he plays Guitar with his Right Hand. He decided to do this very early on. The ability to use both hand equally has got to be a bonus. Especially when he as a Veterinary Surgeon is in the operating theatre. So perhaps looking at the big picture could help in allsorts of ways. Whichever method is chosen I hope all goes well and I wish you great success.