Maybe. Depends a bit on how long you intend to tour, what kind of touring, and how long you expect to do with the bike the rest of the time.

My general feeling is: you can tour on almost anything for up to 2 weeks straight, as long as the gearing is low enough and the chainstays are long enough. More than 2 weeks and you'll probably start to appreciate a few specific things:

• robust frame and components
• wide tires, and maybe the ability to take fenders
• stable geometry & handling
• can soak up road buzz
• multiple hand positions

Or, you might just not be a very picky cyclist, in which case I think you'd be fine.

I went for a Surly Cross Check, which isn't an όber tourer, but is very versatile and is good on gravel and dirt paths. The CC is steel, is available as a frameset, and has horizontal dropouts. Putting an IH on one should be no problem.

Similar frames include the Salsa Casseroll and Soma Double Cross. Not sure which of those has vertical or horizontal dropouts.