I can tell you that Wufoo + Typekit integration is currently in development, so this won’t be a problem for much longer. Can’t promise a date, but keep your eyes peeled to the Wufoo blog.
And yeah, you can use @font-face with Wufoo’s custom CSS feature. If you are using Firefox as your development browser, you won’t see the fonts though. Unfortunately @font-face fonts in Firefox are subject to the same-domain policy, meaning because the form is ultimately hosted on Wufoo.com (it’s an iframe) and the fonts are on your site, the fonts won’t show up. They will work in IE, Opera, Webkit, etc.