I think you should pick up a pair of AE's. Don't lie to your dad (of course), but tell him the virtues of buying decent quality shoes. He will likely wear out 5-6 lower quality shoes in the time it takes him to wear out these (i.e. the kind of sound investment you'd like to see your minister make). Also, AE's don't look like luxury shoes, and therefore doesn't imply him being particularly indulgent and/or vain.