I accomplished the same, using a slightly different process.
I'm running Windows 7 64-bit, with US settings. I do have alternate character sets enabled, since I use several European languages on a regular basis, for business purposes.
I have 2 user profiles set up on my primary computer.
My primary tree, with photos, documents, etc., resides on ancestry.com and syncs to FTM 2012, from one user profile. That tree is private.
From the OTHER user profile, if I open my tree in FTM, it tells me that it is not sync-ed. I then upload that tree, without media, choosing the unlinked option. I upload a new tree version every few weeks - when I have made enough changes to warrant the effort. That tree is public.
By choosing the unlinked option for the public tree, I cannot run the risk of accidentally changing the wrong version of my tree or of confusing FTM.
I have a few names with accented characters, and I have not noticed any issues. Before I upload a fresh version (probably next week), I'll put a few test names in, to verify.