Mooh's comment actually well supports the learn right handed notion. You can experiment easily with other peoples instruments once you are established in learning the guitar you have. (That being said, Bill Staines isn't a good role model for the beginner left hand conversion guitarist.)

I'd look for small body, short scale instruments to start with.(Guild M-20, Gibson LG 1, L-00) Or a parlor guitar.(Martin 0-16 or other ) sizes, Larrivee) They are hard to find so maybe small body FULL scale is the next best choice. I believe Seagull covers both of these requirements and they aren't budget busters. Martin and Taylor both cover this ground but are a bit pricey.

Don