I'm also a southpaw, but have had to adapt to a right-handed world. Because I started using the right-handed Thermopen and have gotten used to it, I would actually find it rather difficult to change over to a left-handed one now.
It's like golf, since I started with a right-hand set, I couldn't use a left-handed set if I tried.
Adapt, Improvise, Overcome!
Lead Cook 'Second Star BBQ' using a Big Orange 'Prince', 22 OTG, SJS FBA & KCBS CBJ