To be honest... I'd love to see a healer like this.

I'm also partial to it being the incarnation of Flintlock from Tactics A2.

For a number of reasons:

1) Magical cannons are cool.

2) In Tactics A2, only Moogles could be Flintlocks. As such, it would be reasonably likely that the job teacher would be a Moogle. Which would likely lead to some very entertaining job quests.

3) Every healer, at some point, has wanted to shoot one of their party members with a cannon... Well, that could become a reality!