Don, it's not something you're very likely to come across, unless it's an ultra-trad folk club (in which case the fact it's more recent than the Boer War will itself weight against you ;-). It's more whether you do it well or badly.

If you went into a pub in downtown Houston, did your intros in your regular accent, and then started into singing in an obviously fake Deliverance-imitation accent, it's probably safe to say your performance wouldn't be well received, am I right...?

Graham.